The Meaning of John 17:3 Explained

John 17:3

KJV: And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

YLT: and this is the life age-during, that they may know Thee, the only true God, and him whom Thou didst send -- Jesus Christ;

Darby: And this is the eternal life, that they should know thee, the only true God, and Jesus Christ whom thou hast sent.

ASV: And this is life eternal, that they should know thee the only true God, and him whom thou didst send, even Jesus Christ.

KJV Reverse Interlinear

And  this  is  life  eternal,  that  they might know  thee  the only  TRUE  God,  and  Jesus  Christ,  whom  thou hast sent. 

What does John 17:3 Mean?

Verse Meaning

Jesus proceeded to define the nature of eternal life. Eternal life is essentially knowing (Gr. ginoskosin, cf. Genesis 4:1 LXX Matthew 1:25) God experientially through faith in His Son (cf. John 3:5; Jeremiah 31:34; Habakkuk 2:14; Hebrews 8:11). Jesus described it in terms of relationship rather than duration. Everyone will live forever somewhere. However the term "eternal life" as Jesus used it means much more than long life.
"Life is active involvement with environment; death is the cessation of involvement with the environment, whether it be physical or personal. The highest kind of life is involvement with the highest kind of environment. A worm is content to live in soil; we need not only the wider environment of earth, sea, and sky but also contact with other human beings. For the complete fulfillment of our being, we must know God. This, said Jesus, constitutes eternal life. Not only is it endless, since the knowledge of God would require an eternity to develop fully, but qualitatively it must exist in an eternal dimension." [1]
Jesus described the Father here as the only true God. He is knowable only through Jesus Christ whom He sent (cf. John 1:18; Matthew 11:27). We sometimes say that it is a blessing and an inspiration to know certain people. This is all the more true when we know God. Knowing Him changes us and introduces us into a different quality of living. [2]

Context Summary

John 17:1-10 - Jesus Prays For His Own
In Christ's own oratory we hear Him pray. But how wonderful! There is a tone of expectant faith in this marvelous prayer of assured trust, as if He knew that He was asking what was in His Father's heart and thought. The Lord speaks as if He had already passed through death, and were pleading before the throne. He is glad to have authority only that He may use it to give life.
The Father's gift to Jesus consisted in the men who followed Him, the word He spoke, the works He did, the name He bore. How careful the Good Shepherd was of those who had been given to Him! He prayed for them, He kept them, He entrusted them as His dying legacy to His Father's care. Though He did not pray directly for the world, He was doing His best for it, in concentrating all His solicitude on those who were to be the messengers of His gospel.
In John 17:10 we are reminded of Luke 15:31. The very words which the father said to the elder brother are here appropriated by our Lord; and we are taught that we have the privilege of entering on the same inheritance of grace and power as our Lord had. He won for us, unworthy though we are, the privilege of saying, All thine are mine. If only we believed this, and lived as children in our Father's house, how different life would become. [source]

Chapter Summary: John 17

1  Jesus prays to his Father

Greek Commentary for John 17:3

Should know [γινωσκωσιν]
Present active subjunctive with ινα — hina (subject clause), “should keep on knowing.” Even Jesus Christ See John 1:17 for the only other place in John‘s Gospel where the words occur together. Coming here in the Lord‘s own prayer about himself they create difficulty, unless, as Westcott suggests, Χριστον — Christon be regarded as a predicate accusative, “Jesus as the Christ” (Messiah). Otherwise the words would seem to be John‘s parenthetical interpretation of the idea of Jesus. Lucke thinks that the solemnity of this occasion explains Jesus referring to himself in the third person. The knowledge of “the only true God” is through Jesus Christ (John 14:6-9). [source]
TRUE [ἀληθινὸν]
See on John 1:9. Compare 1 Corinthians 8:4; 1 Timothy 6:15. [source]
Life eternal []
With the article: the life eternal. Defining the words in the previous verse. The life eternal (of which I spoke) is this. [source]
Might know [γινώσκωσι]
Might recognize or perceive. This is striking, that eternal life consists in knowledge, or rather the pursuit of knowledge, since the present tense marks a continuance, a progressive perception of God in Christ. That they might learn to know. Compare John 17:23; John 10:38; 1 John 5:20; 1 John 4:7, 1 John 4:8.“I say, the acknowledgment of God in ChristAccepted by thy reason, solves for thee All questions in the earth and out of it,-DIVIDER-
And has so far advanced thee to be wise. -DIVIDER-
-DIVIDER-
Wouldst thou improve this to reprove the proved?-DIVIDER-
In life's mere minute, with power to use that proof,-DIVIDER-
Leave knowledge and revert to how it sprung?-DIVIDER-
Thou hast it; use it, and forthwith, or die. -DIVIDER-
-DIVIDER-
For this I say is death, and the sole death,-DIVIDER-
When a man's loss comes to him from his gain,-DIVIDER-
Darkness from light, from knowledge ignorance,-DIVIDER-
And lack of love from love made manifest.”Robert Browning, “A Death in the Desert.” The relation of perception of God to character is stated in 1 John 3:2, on which see note. [source]

That [ἵνα]
Expressing the aim. [source]
Jesus Christ, whom Thou hast sent []
The Rev. brings out better the emphasis of the Greek order: and Him whom Thou didst send, even Jesus Christ. Didst send ( ἀπέστειλας ). The aorist tense, emphasizing the historic fact of Christ's mission. [source]

Reverse Greek Commentary Search for John 17:3

Matthew 23:10 Masters [κατηγηται]
This word occurs here only in the N.T. It is found in the papyri for teacher (Latin, doctor). It is the modern Greek word for professor. “While διδασκαλος — didaskalos represents αβ — Rab κατηγητες — kathēgētes stands for the more honourable αββαν βων — Rabban διδασκαλος — ̇bōn ” (McNeile). Dalman (Words of Jesus, p. 340) suggests that the same Aramaic word may be translated by either κατηγητες — didaskalos or ο Χριστος — kathēgētes Christ The use of these words here by Jesus like “Jesus Christ” in his Prayer (John 17:3) is held by some to show that they were added by the evangelist to what Jesus actually said, since the Master would not have so described himself. But he commended Peter for calling him “the Christ the Son of the living God” (Matthew 16:16.). We must not empty the consciousness of Jesus too much. [source]
Luke 4:18 He hath sent me [απεσταλκεν με]
Change of tense to perfect active indicative. He is now on that mission here. Jesus is God‘s Apostle to men (John 17:3, Whom thou didst send). [source]
Luke 4:18 To the poor [πτωχοις]
Jesus singles this out also as one of the items to tell John the Baptist in prison (Luke 7:22). Our word Gospel is a translation of the Greek Ευαγγελιον — Euaggelion and it is for the poor.He hath sent me (απεσταλκεν με — apestalken me). Change of tense to perfect active indicative. He is now on that mission here. Jesus is God‘s Apostle to men (John 17:3, Whom thou didst send).Proclaim As a herald like Noah (2 Peter 2:5).To the captives (αιχμαλωτοις — aichmalōtois). Prisoners of war will be released (αιχμη — aichmē a spear point, and αλωτος — halōtos from αλισκομαι — haliskomai to be captured). Captured by the spear point. Common word, but here only in the N.T.Set at liberty First aorist active infinitive of αποστελλω — apostellō Same verb as απεσταλκεν — apestalken above. Brought in here from Isaiah 58:6. Plummer suggests that Luke inserts it here from memory. But Jesus could easily have turned back the roll and read it so.Them that are bruised (τετραυσμενους — tethrausmenous). Perfect passive participle of τραυω — thrauō an old verb, but here only in the N.T. It means to break in pieces broken in heart and often in body as well. One loves to think that Jesus felt it to be his mission to mend broken hearts like pieces of broken earthenware, real rescue-mission work. Jesus mends them and sets them free from their limitations. [source]
Luke 6:13 He chose from them twelve [εκλεχαμενος απ αυτων δωδεκα]
The same root It was a crisis in the work of Christ. Jesus assumed full responsibility even for the choice of Judas who was not forced upon Jesus by the rest of the Twelve. “You did not choose me, but I chose you,” (John 15:16) where Jesus uses εχελεχαστε — exelexasthe and εχελεχαμην — exelexamēn as here by Luke.Whom also he named apostles (ους και αποστολους ωνομασεν — hous kai apostolous ōnomasen). So then Jesus gave the twelve chosen disciples this appellation. Aleph and B have these same words in Mark 3:14 besides the support of a few of the best cursives, the Bohairic Coptic Version and the Greek margin of the Harclean Syriac. Westcott and Hort print them in their text in Mark 3:14, but it remains doubtful whether they were not brought into Mark from Luke 6:13 where they are undoubtedly genuine. See note on Matthew 10:2 where the connection with sending them out by twos in the third tour of Galilee. The word is derived from αποστελλω — apostellō to send (Latin, mitto) and apostle is missionary, one sent. Jesus applies the term to himself (απεστειλας — apesteilas John 17:3) as does Hebrews 3:1. The word is applied to others, like Barnabas, besides these twelve including the Apostle Paul who is on a par with them in rank and authority, and even to mere messengers of the churches (2 Corinthians 8:23). But these twelve apostles stand apart from all others in that they were all chosen at once by Jesus himself “that they might be with him” (Mark 3:14), to be trained by Jesus himself and to interpret him and his message to the world. In the nature of the case they could have no successors as they had to be personal witnesses to the life and resurrection of Jesus (Acts 1:22). The selection of Matthias to succeed Judas cannot be called a mistake, but it automatically ceased. For discussion of the names and groups in the list see notes on Matthew 10:1-4; and notes on Mark 3:14-19. [source]
John 5:44 Seek not the honor that cometh from God only [καὶ τὴν δόξαν τὴν μόνου Θεοῦ οὐ ζητεῖτε]
The Rev. gives it capitally, following the Greek order: and the glory that cometh from the only God ye seek not. Not God only, which entirely overlooks the force of the definite article; but the only God. Compare 1 Timothy 6:15, 1 Timothy 6:16; John 17:3; Romans 16:27. [source]
John 3:19 This []
That is, herein consists the judgment. The prefacing a statement with this is, and then defining the statement by ὅτι or ἵνα , that, is characteristic of John. See John 15:12; John 17:3; 1 John 1:5; 1 John 5:11, 1 John 5:14; 3 John 1:6. [source]
John 3:11 We speak - we know - we have seen []
After the use of the singular number in John 3:3, John 3:5, John 3:7, John 3:12, the plural here is noteworthy. It is not merely rhetorical - “a plural of majesty” - but is explained by John 3:8, “every one that is born of the Spirit.” The new birth imparts a new vision. The man who is born of the Spirit hath eternal life (John 3:36); and life eternal is to know God and Jesus Christ whom He hath sent (John 17:3). “Ye have an anointing from the Holy One, and ye know ( οἴδατε ) all things” (1 John 2:20). He who is born of water and of the Spirit sees the kingdom of God. This we therefore includes, with Jesus, all who are truly born anew of the Spirit. Jesus meets the we know of Nicodemus (John 3:2), referring to the class to which he belonged, with another we know, referring to another class, of which He was the head and representative. We know ( οἴδαμεν ), absolutely. See on John 2:24. [source]
John 1:4 In Him was life [ἐν αὐτῷ ζωὴ ἦν]
He was the fountain of life - physical, moral, and eternal - its principle and source. Two words for life are employed in the New Testament: βίος and ζωὴ . The primary distinction is that ζωὴ means existence as contrasted with death, and βίος , the period, means, or manner of existence. Hence βίος is originally the higher word, being used of men, while ζωὴ is used of animals ( ζῶα ). We speak therefore of the discussion of the life and habits of animals as zoo logy; and of accounts of men's lives as bio graphy. Animals have the vital principle in common with men, but men lead lives controlled by intellect and will, and directed to moral and intellectual ends. In the New Testament, βίος means either living, i.e., means of subsistence (Mark 12:44; Luke 8:43), or course of life, life regarded as an economy (Luke 8:14; 1 Timothy 2:2; 2 Timothy 2:4). Ζωὴ occurs in the lower sense of life, considered principally or wholly as existence (1 Peter 3:10; Acts 8:33; Acts 17:25; Hebrews 7:3). There seems to be a significance in the use of the word in Luke 16:25: “Thou in thy lifetime ( ἐν τῇ ζωῇ σου ) receivedst thy good things;” the intimation being that the rich man's life had been little better than mere existence, and not life at all in the true sense. But throughout the New Testament ζωὴ is the nobler word, seeming to have changed places with βίος . It expresses the sum of mortal and eternal blessedness (Matthew 25:46; Luke 18:30; John 11:25; Acts 2:28; Romans 5:17; Romans 6:4), and that not only in respect of men, but also of God and Christ. So here. Compare John 5:26; John 14:6; 1 John 1:2. This change is due to the gospel revelation of the essential connection of sin with death, and consequently, of life with holiness. “Whatever truly lives, does so because sin has never found place in it, or, having found place for a time, has since been overcome and expelled” (Trench). Ζωὴ is a favorite word with John. See John 11:25; John 14:6; John 8:12; 1 John 1:2; 1 John 5:20; John 6:35, John 6:48; John 6:63; Revelation 21:6; Revelation 22:1, Revelation 22:17; Revelation 7:17; John 4:14; Revelation 2:7; Revelation 22:2, Revelation 22:14, Revelation 22:19; John 12:50; John 17:3; John 20:31; John 5:26; John 6:53, John 6:54; John 5:40; John 3:15, John 3:16, John 3:36; John 10:10; John 5:24; John 12:25; John 6:27; John 4:36; 1 John 5:12, 1 John 5:16; John 6:51.Was the Light of men ( ἦν τὸ φῶς τῶν ἀνθρώπων )Passing from the thought of creation in general to that of mankind, who, in the whole range of created things, had a special capacity for receiving the divine. The Light - the peculiar mode of the divine operation upon men, conformably to their rational and moral nature which alone was fitted to receive the light of divine truth. It is not said that the Word was light, but that the life was the light. The Word becomes light through the medium of life, of spiritual life, just as sight is a function of physical life. Compare John 14:6, where Christ becomes the life through being the truth; and Matthew 5:8, where the pure heart is the medium through which God is beheld. In whatever mode of manifestation the Word is in the world, He is the light of the world; in His works, in the dawn of creation; in the happy conditions of Eden; in the Patriarchs, in the Law and the Prophets, in His incarnation, and in the subsequent history of the Church. Compare John 9:5. Of men, as a class, and not of individuals only. [source]
John 17:4 I glorified thee on the earth [εγω σε εδοχασα επι της γης]
John 17:3 is parenthetical and so John 17:4 goes on after John 17:2. He had prayed for further glorification. Having accomplished First aorist active participle of τελειοω — teleioō old verb from τελειος — teleios (perfect). Used in John 4:34 by Jesus with το εργον — to ergon as here. That was Christ‘s “food” Christ does not die as a disappointed man, but as the successful messenger, apostle Perfect active indicative of διδωμι — didōmi regarded as a permanent task. [source]
John 4:34 To do the will [ινα ποιησω το τελημα]
Non-final use of ινα — hina and the first aorist active subjunctive as subject or predicate nominative as in John 6:29; John 15:8; John 17:3. The Messianic consciousness of Jesus is clear and steady (John 5:30; John 6:38). He never doubted that the Father sent him. And to accomplish his work ινα — Hina understood with τελειωσω — teleiōsō in like idiom, first aorist active subjunctive of τελειοω — teleioō (from τελειος — teleios), to bring to an end. See John 5:36. In John 17:4 (the Intercessory Prayer) he will say that he has done He will carry through the Father‘s programme (John 3:16). That is his “food.” He had been doing that in winning the woman to God. [source]
John 5:44 How can ye believe? [πως δυναστε υμεις πιστευσαι]
Emphasis on “ye” From the only God B and W omit τεου — theou which is certainly meant even if not genuine here. See John 17:3; Romans 16:27; 1 Timothy 6:15. [source]
John 7:29 I know him [εγω οιδα αυτον]
In contrast to the ignorance of these people. See the same words in John 8:55 and the same claim in John 17:25; Matthew 11:27; Luke 10:22 (the Johannine aerolite). “These three words contain the unique claim of Jesus, which is pressed all through the chapters of controversy with the Jews” (Bernard). Jesus is the Interpreter of God to men (John 1:18). And he sent me First aorist active indicative of αποστελλω — apostellō the very verb used of Jesus when he sent forth the twelve (Matthew 10:5) and used by Jesus again of himself in John 17:3. He is the Father‘s Apostle to men. [source]
John 1:17 Was given [εδοτη]
First aorist passive indicative of διδωμι — didōmi By Moses “Through Moses” as the intermediate agent of God. Came The historical event, the beginning of Christianity. By Jesus Christ “Through Jesus Christ,” the intermediate agent of God the Father. Here in plain terms John identifies the Pre-incarnate Logos with Jesus of Nazareth, the Messiah. The full historical name “Jesus Christ” is here for the first time in John. See also John 17:3 and four times in 1John and five times in Revelation. Without Christ there would have been no Christianity. John‘s theology is here pictured by the words “grace and truth” (η χαρις και η αλητεια — hē charis kai hē alētheia), each with the article and each supplementary to the other. It is grace in contrast with law as Paul sets forth in Galatians and Romans. Paul had made grace “a Christian commonplace” (Bernard) before John wrote. It is truth as opposed to Gnostic and all other heresy as Paul shows in Colossians and Ephesians. The two words aptly describe two aspects of the Logos and John drops the use of Λογος — Logos and χαρις — charis but clings to αλητεια — alētheia (see John 8:32 for the freedom brought by truth), though the ideas in these three words run all through his Gospel. [source]
John 17:8 The words [τα ρηματα]
Plural, each word of God, as in John 3:34, and of Christ (John 5:47; John 6:63, John 6:68), while the singular Second aorist active indicative of γινωσκω — ginōskō like ελαβον — elabon in contrast with εγνωκαν — egnōkan (perfect) in John 17:7. They definitely “received and recognized truly” There was comfort to Christ in this fact. They believed Another aorist parallel with ελαβον — elabon and εγνωσαν — egnōsan The disciples believed in Christ‘s mission from the Father (John 6:69; Matthew 16:16). Note απεστειλας — apesteilas here as in John 17:3. Christ is God‘s Apostle to man (Hebrews 3:1). This statement, like a solemn refrain (Του διδστ σενδ με — Thou didst send me), occurs five times in this prayer (John 17:8, John 17:18, John 17:21, John 17:23, John 17:25). [source]
John 3:15 That whosoever believeth may in him have eternal life [ινα πας ο πιστευων εν αυτωι εχηι ζωην αιωνιον]
Final use of ινα — hina with present active subjunctive of εχω — echō that he may keep on having eternal life (a frequent phrase in John, always in John αιωνιος — aiōnios occurs with ζωη — zōē 16 times in the Gospel, 6 in 1John, ageless or endless life, beginning now and lasting forever). It is more than endless, for it is sharing in the life of God in Christ (John 5:26; John 17:3; 1 John 5:12). So here εν αυτωι — en autōi (in him) is taken with εχηι — echēi rather than with πιστευων — pisteuōn The interview with Nicodemus apparently closes with John 3:15. In John 3:16-21 we have past tenses constantly as is natural for the reflection of John, but unnatural for Jesus speaking. There are phrases like the Prologue (John 3:19; John 1:9-11). “Only begotten” does not occur elsewhere in the words of Jesus, but is in John 1:14, John 1:18; 1 John 4:9. John often puts in explanatory comments (John 1:16-18; John 12:37-41). [source]
John 3:19 And this is the judgment [αυτη δε εστιν η κρισις]
A thoroughly Johannine phrase for sequence of thought (John 15:12; John 17:3; 1 John 1:5; 1 John 5:11, 1 John 5:14; 3 John 1:6). It is more precisely the process of judging The light is come Second perfect active indicative of το σκοτος — erchomai a permanent result as already explained in the Prologue concerning the Incarnation (John 1:4, John 1:5, John 1:9, John 1:11). Jesus is the Light of the world. Loved darkness Job (Job 24:13) spoke of men rebelling against the light. Here πονηρα — to skotos common word for moral and spiritual darkness (1 Thessalonians 5:5), though Πονηρος — hē skotia in John 1:5. “Darkness” is common in John as a metaphor for the state of sinners (John 8:12; John 12:35, John 12:46; 1 John 1:6; 1 John 2:8, 1 John 2:9, 1 John 2:11). Jesus himself is the only moral and spiritual light of the world (John 8:12) as he dared claim to his enemies. The pathos of it all is that men fall in love with the darkness of sin and rebel against the light like denizens of the underworld, “for their works were evil In the end the god of this world blinds men‘s eyes so that they do not see the light (2 Corinthians 4:4). The fish in the Mammoth Cave have no longer eyes, but only sockets where eyes used to be. The evil one has a powerful grip on the world (1 John 5:19). [source]
1 Corinthians 8:2 That he knoweth anything [ἐγνωκέναι τι]
Or, literally, has come to know. See on John 2:24; see on John 3:10; see on John 17:3. Showing in what sense knowledge was used in the previous clause: fancied knowledge; knowledge of divine things without love. [source]
1 Corinthians 8:3 The same is known of Him [οὗτος ἔγνωσται ὑπ ' αὐτοῦ]
The same, i.e., this same man who loves God. He does not say knows God, but implies this in the larger truth, is known by God. Compare Galatians 4:9; 1 John 4:7, 1 John 4:8, 1 John 4:16; 2 Timothy 2:19. Γινώσκω in New-Testament Greek often denotes a personal relation between the knower and the known, so that the knowledge of an object implies the influence of that object upon the knower. So John 2:24, John 2:25; 1 Corinthians 2:8; 1 John 4:8. In John the relation itself is expressed by the verb. John 17:3, John 17:25; 1 John 5:20; 1 John 4:6; 1 John 2:3, 1 John 2:4, 1 John 2:5. [source]
Galatians 4:9 Rather are known of God []
Rather corrects the first statement, have known God, which might seem to attach too much to human agency in attaining the knowledge of God. The divine side of the process is thrown into the foreground by are known, etc. Known does not mean approved or acknowledged, but simply recognized. Saving knowledge is doubtless implied, but is not expressed in the word. The relation of knowledge between God and his sons proceeds from God. The Galatians had not arrived at the knowledge of God by intuition nor by any process of reasoning. “God knew them ere they knew him, and his knowing them was the cause of their knowing him” (Eadie). Comp. 1 Corinthians 13:12; 2 Timothy 2:19; Matthew 7:23. Dean Stanley remarks that “our knowledge of God is more his act than ours.” If God knows a man, that fact implies an activity of God which passes over to the man, so that he, as the subject of God's knowledge, comes into the knowledge of God. In N.T. γινώσκειν often implies a personal relation between the knower and the known, so that knowledge implies influence. See 1 Corinthians 2:8; John 1:10; John 2:24; John 17:3. For a parallel to this interchange between the active and the passive, see Philemon 3:12. [source]
2 Thessalonians 1:9 Glory of his power [δόξης τῆς ἰσχύος αὐτοῦ]
For glory see on 1 Thessalonians 2:12. Ἱσχὺς powernot often in Paul. It is indwelling power put forth or embodied, either aggressively or as an obstacle to resistance: physical power organized or working under individual direction. An army and a fortress are both ἰσχυρὸς. The power inhering in the magistrate, which is put forth in laws or judicial decisions, is ἰσχὺς , and makes the edicts ἰσχυρὰ validand hard to resist. Δύναμις is the indwelling power which comes to manifestation in ἰσχὺς The precise phrase used here does not appear elsewhere in N.T. In lxx, Isaiah 2:10, Isaiah 2:19, Isaiah 2:21. The power ( δύναμις ) and glory of God are associated in Matthew 24:30; Mark 13:26; Luke 21:27; Revelation 4:11; Revelation 19:1. Comp. κράτος τῆς δόξης αὐτοῦ strengthof his glory, Colossians 1:11. Additional Note on ὄλεθρον αἰώνιον eternaldestruction, 2 Thessalonians 1:9 Ἁιών transliterated eon is a period of time of longer or shorter duration, having a beginning and an end, and complete in itself. Aristotle ( περὶ οὐρανοῦ , i. 9,15) says: “The period which includes the whole time of each one's life is called the eon of each one.” Hence it often means the life of a man, as in Homer, where one's life ( αἰών ) is said to leave him or to consume away (Il. v. 685; Od. v. 160). It is not, however, limited to human life; it signifies any period in the course of events, as the period or age before Christ; the period of the millennium; the mytho-logical period before the beginnings of history. The word has not “a stationary and mechanical value” (De Quincey). It does not mean a period of a fixed length for all cases. There are as many eons as entities, the respective durations of which are fixed by the normal conditions of the several entities. There is one eon of a human life, another of the life of a nation, another of a crow's life, another of an oak's life. The length of the eon depends on the subject to which it is attached. It is sometimes translated world; world representing a period or a series of periods of time. See Matthew 12:32; Matthew 13:40, Matthew 13:49; Luke 1:70; 1 Corinthians 1:20; 1 Corinthians 2:6; Ephesians 1:21. Similarly οἱ αἰῶνες theworlds, the universe, the aggregate of the ages or periods, and their contents which are included in the duration of the world. 1 Corinthians 2:7; 1 Corinthians 10:11; Hebrews 1:2; Hebrews 9:26; Hebrews 11:3. -DIVIDER-
-DIVIDER-
The word always carries the notion of time, and not of eternity. It always means a period of time. Otherwise it would be impossible to account for the plural, or for such qualifying expressions as this age, or the age to come. It does not mean something endless or everlasting. To deduce that meaning from its relation to ἀεί is absurd; for, apart from the fact that the meaning of a word is not definitely fixed by its derivation, ἀεί does not signify endless duration. When the writer of the Pastoral Epistles quotes the saying that the Cretans are always ( ἀεί ) liars (Titus 1:12), he surely does not mean that the Cretans will go on lying to all eternity. See also Acts 7:51; 2 Corinthians 4:11; 2 Corinthians 6:10; Hebrews 3:10; 1 Peter 3:15. Ἁεί means habitually or continually within the limit of the subject's life. In our colloquial dialect everlastingly is used in the same way. “The boy is everlastingly tormenting me to buy him a drum.”-DIVIDER-
In the New Testament the history of the world is conceived as developed through a succession of eons. A series of such eons precedes the introduction of a new series inaugurated by the Christian dispensation, and the end of the world and the second coming of Christ are to mark the beginning of another series. See Ephesians 3:11. Paul contemplates eons before and after the Christian era. Ephesians 1:21; Ephesians 2:7; Ephesians 3:9, Ephesians 3:21; 1 Corinthians 10:11; comp. Hebrews 9:26. He includes the series of eons in one great eon, ὁ αἰὼν τῶν αἰώνων theeon of the eons (Ephesians 3:21); and the author of the Epistle to the Hebrews describes the throne of God as enduring unto the eon of the eons (Hebrews 1:8). The plural is also used, eons of the eons, signifying all the successive periods which make up the sum total of the ages collectively. Romans 16:27; Galatians 1:5; Philemon 4:20, etc. This plural phrase is applied by Paul to God only. -DIVIDER-
-DIVIDER-
The adjective αἰώνιος in like manner carries the idea of time. Neither the noun nor the adjective, in themselves, carry the sense of endless or everlasting. They may acquire that sense by their connotation, as, on the other hand, ἀΐ̀διος , which means everlasting, has its meaning limited to a given point of time in Judges 1:6. Ἁιώνιος means enduring through or pertaining to a period of time. Both the noun and the adjective are applied to limited periods. Thus the phrase εἰς τὸν αἰῶνα , habitually rendered forever, is often used of duration which is limited in the very nature of the case. See, for a few out of many instances, lxx, Exodus 21:6; Exodus 29:9; Exodus 32:13; Joshua 14:9; 1 Samuel 8:13; Leviticus 25:46; Deuteronomy 15:17; 1 Chronicles 28:4. See also Matthew 21:19; John 13:8; 1 Corinthians 8:13. The same is true of αἰώνιος . Out of 150 instances in lxx, four-fifths imply limited duration. For a few instances see Genesis 48:4; Numbers 10:8; Numbers 15:15; Proverbs 22:28; Jonah 2:6; Habakkuk 3:6; Isaiah 61:8. -DIVIDER-
-DIVIDER-
Words which are habitually applied to things temporal or material can not carry in themselves the sense of endlessness. Even when applied to God, we are not forced to render αἰώνιος everlastingOf course the life of God is endless; but the question is whether, in describing God as αἰώνιος , it was intended to describe the duration of his being, or whether some different and larger idea was not contemplated. That God lives longer than men, and lives on everlastingly, and has lived everlastingly, are, no doubt, great and significant facts; yet they are not the dominant or the most impressive facts in God's relations to time. God's eternity does not stand merely or chiefly for a scale of length. It is not primarily a mathematical but a moral fact. The relations of God to time include and imply far more than the bare fact of endless continuance. They carry with them the fact that God transcends time; works on different principles and on a vaster scale than the wisdom of time provides; oversteps the conditions and the motives of time; marshals the successive eons from a point outside of time, on lines which run out into his own measureless cycles, and for sublime moral ends which the creature of threescore and ten years cannot grasp and does not even suspect. -DIVIDER-
-DIVIDER-
There is a word for everlasting if that idea is demanded. That αἰώνιος occurs rarely in the New Testament and in lxx does not prove that its place was taken by αἰώνιος . It rather goes to show that less importance was attached to the bare idea of everlastingness than later theological thought has given it. Paul uses the word once, in Romans 1:20, where he speaks of “the everlasting power and divinity of God.” In Romans 16:26he speaks of the eternal God ( τοῦ αἰωνίου θεοῦ ); but that he does not mean the everlasting God is perfectly clear from the context. He has said that “the mystery” has been kept in silence in times eternal ( χρόνοις αἰωνίοις ), by which he does not mean everlasting times, but the successive eons which elapsed before Christ was proclaimed. God therefore is described as the God of the eons, the God who pervaded and controlled those periods before the incarnation. To the same effect is the title ὁ βασιλεὺς τῶν αἰώνων theKing of the eons, applied to God in 1 Timothy 1:17; Revelation 15:3; comp. 2Timothy href="/desk/?q=2ti+1:9&sr=1">2 Timothy 1:9; Titus 1:2), cannot mean before everlasting times. To say that God bestowed grace on men, or promised them eternal life before endless times, would be absurd. The meaning is of old, as Luke 1:70. The grace and the promise were given in time, but far back in the ages, before the times of reckoning the eons. -DIVIDER-
-DIVIDER-
Ζωὴ αἰώνιος eternallife, which occurs 42 times in N.T., but not in lxx, is not endless life, but life pertaining to a certain age or eon, or continuing during that eon. I repeat, life may be endless. The life in union with Christ is endless, but the fact is not expressed by αἰώνιος . Κόλασις αἰώνιος , rendered everlasting punishment (Matthew 25:46), is the punishment peculiar to an eon other than that in which Christ is speaking. In some cases ζωὴ αἰώνιος does not refer specifically to the life beyond time, but rather to the eon or dispensation of Messiah which succeeds the legal dispensation. See Matthew 19:16; John 5:39. John says that ζωὴ αἰώνιος is the present possession of those who believe on the Son of God, John 3:36; John 5:24; John 6:47, John 6:64. The Father's commandment is ζωὴ αἰώσιος , John 12:50; to know the only true God and Jesus Christ is ζωὴ αἰώνιος , John 17:3. -DIVIDER-
-DIVIDER-
Bishop Westcott very justly says, commenting upon the terms used by John to describe life under different aspects: “In considering these phrases it is necessary to premise that in spiritual things we must guard against all conclusions which rest upon the notions of succession and duration. 'Eternal life' is that which St. Paul speaks of as ἡ ὄντως ζωὴ thelife which is life indeed, and ἡ ζωὴ τοῦ θεοῦ thelife of God. It is not an endless duration of being in time, but being of which time is not a measure. We have indeed no powers to grasp the idea except through forms and images of sense. These must be used, but we must not transfer them as realities to another order.”-DIVIDER-
Thus, while αἰώνιος carries the idea of time, though not of endlessness, there belongs to it also, more or less, a sense of quality. Its character is ethical rather than mathematical. The deepest significance of the life beyond time lies, not in endlessness, but in the moral quality of the eon into which the life passes. It is comparatively unimportant whether or not the rich fool, when his soul was required of him (Luke 12:20), entered upon a state that was endless. The principal, the tremendous fact, as Christ unmistakably puts it, was that, in the new eon, the motives, the aims, the conditions, the successes and awards of time counted for nothing. In time, his barns and their contents were everything; the soul was nothing. In the new life the soul was first and everything, and the barns and storehouses nothing. The bliss of the sanctified does not consist primarily in its endlessness, but in the nobler moral conditions of the new eon, - the years of the holy and eternal God. Duration is a secondary idea. When it enters it enters as an accompaniment and outgrowth of moral conditions. -DIVIDER-
-DIVIDER-
In the present passage it is urged that ὄλεθρον destructionpoints to an unchangeable, irremediable, and endless condition. If this be true, if ὄλεθρος isextinction, then the passage teaches the annihilation of the wicked, in which case the adjective αἰώνιος is superfluous, since extinction is final, and excludes the idea of duration. But ὄλεθρος does not always mean destruction or extinction. Take the kindred verb ἀπόλλυμι todestroy, put an end to, or in the middle voice, to be lost, to perish. Peter says, “the world being deluged with water, perished ” ( ἀπολοῦνται 2 Peter 3:6); but the world did not become extinct, it was renewed. In Hebrews 1:11, Hebrews 1:12quoted from Isaiah href="/desk/?q=isa+51:6&sr=1">Isaiah 51:6, Isaiah 51:16; Isaiah 65:17; Isaiah 66:22; 2 Peter 3:13; Revelation 21:1. Similarly, “the Son of man came to save that which was lost ” ( ἀπολωλός ), Luke 19:10. Jesus charged his apostles to go to the lost ( ἀπολωλότα ) sheep of the house of Israel, Matthew 10:6, comp. Matthew 15:24. “He that shall lose ( ἀπολέσῃ ) his life for my sake shall find it,” Matthew 16:25. Comp. Luke 15:6, Luke 15:9, Luke 15:32. -DIVIDER-
-DIVIDER-
In this passage the word destruction is qualified. It is “destruction from the presence of the Lord and from the glory of his power, “ at his second coming, in the new eon. In other words, it is the severance, at a given point of time, of those who obey not the gospel from the presence and the glory of Christ. Ἁιώνιος may therefore describe this severance as continuing during the millennial eon between Christ's coming and the final judgment; as being for the wicked prolonged throughout that eon and characteristic of it, or it may describe the severance as characterizing or enduring through a period or eon succeeding the final judgment, the extent of which period is not defined. In neither case is αἰώνιος to be interpreted as everlasting or endless.sa180 [source]

2 Thessalonians 1:8 On them that know not God - obey not the gospel [τοῖς μὴ εἰδόσι θεὸν - τοῖς μὴ ὑπακούουσιν τῷ εὐγγελίῳ]
To know God is to know him as the one, true God as distinguished from false gods; to know his will, his holiness, his hatred of sin, and his saving intent toward mankind. Two words are used of such knowledge, εἰδέναι and γινώσκειν . Both are applied to the heathen and to Christians, and both are used of the Jews' knowledge of God. Ἑιδέναι , of heathen, Galatians 4:8; 1 Thessalonians 4:5; 2 Thessalonians 1:8. Γινώσκειν of heathen, Romans 1:21; 1 Corinthians 1:21. Ἑιδέναι , of Christ and Christians, John 7:29, John 8:19, John 8:55; John 14:7. Γινώσκειν of Christ and Christians, Galatians 4:9; 1 John 2:13, 1 John 2:14; 1 John 4:6, 1 John 4:7, 1 John 4:8; John 10:15; John 17:3. In John, γινώσκειν of Jews who do not know the Father, John 16:3; John 8:55: εἰδέναι , John 7:28; John 8:19; John 15:21. The two are combined, John 1:26; John 7:27; John 8:55; 2 Corinthians 5:16. A distinction is asserted between γινώσκειν as knowledge grounded in personal experience, apprehension of external impressions - and εἰδέμαι purely mental perception in contrast with conjecture or knowledge derived from others. There are doubtless passages which bear out this distinction (see on John 2:24), but it is impossible to carry it rigidly through the N.T. In the two classes, - those who know not God and those who obey not the gospel, - it is not probable that Paul has in mind a distinction between Jews and Gentiles. The Jews were not ignorant of God, yet they are described by John as not knowing him. The Gentiles are described by Paul as knowing God, but as refusing to glorify him as God (Romans 1:21). Paul rather describes here the subjects of God's judgment as one class, but under different aspects. [source]
1 Timothy 2:4 Come to the knowledge of the truth [εἰς ἐπίγνωσιν ἀληθείας ἐλθεῖν]
The phrase only here and 2 Timothy 3:7. Ἑπίγνωσις is a favorite Pauline word. See on Romans 3:20; see on Colossians 1:9; see on 1 Timothy 2:4; see on 1 Timothy 4:3. It signifies advanced or full knowledge. The difference between the simple γνῶσις and the compound word is illustrated in Romans 1:21, Romans 1:28, and 1 Corinthians 13:12. In N.T. always of the knowledge of things ethical or divine, and never ascribed to God. For ἀλήθεια truthsee on sound doctrine, 1 Timothy 1:10. It appears 14 times in the Pastorals, and always without a defining genitive. So, often in Paul, but several times with a defining genitive, as truth of God, of Christ, of the gospel. The logical relation in the writer's mind between salvation and the knowledge of the truth is not quite clear. Knowledge of the truth may be regarded as the means of salvation, or it may be the ideal goal of the whole saving work. See 1 Corinthians 13:12; Philemon 3:8; John 17:3. The latter is more in accord with the general drift of teaching in these Epistles. [source]
1 Timothy 1:17 Incorruptible [απταρτωι]
As an epithet of God also in Romans 1:23. Invisible (αορατωι — aoratōi). Epithet of God in Colossians 1:15. The only God So Romans 16:27; John 5:44; John 17:3. For ever and ever (εις τους αιωνας των αιωνων — eis tous aiōnas tōn aiōnōn). “Unto the ages of ages.” Cf. Ephesians 3:21 “of the age of the ages.” [source]
1 Timothy 1:17 The only God [μονωι τεωι]
So Romans 16:27; John 5:44; John 17:3. For ever and ever (εις τους αιωνας των αιωνων — eis tous aiōnas tōn aiōnōn). “Unto the ages of ages.” Cf. Ephesians 3:21 “of the age of the ages.” [source]
Hebrews 3:1 Holy brethren [αδελποι αγιοι]
Only here in N.T., for αγιοις — hagiois in 1 Thessalonians 5:27 only in late MSS. See Hebrews 2:11 for same idea. First time the author makes direct appeal to the readers, though first person in Hebrews 2:1. Partakers See Luke 5:7 for “partners” in the fishing, elsewhere in N.T. only in Hebrews (Hebrews 1:9; Hebrews 6:4; Hebrews 12:8) in N.T. Of a heavenly calling Only here in the N.T., though same idea in Hebrews 9:15. See η ανω κλησις — hē anō klēsis in Philemon 3:14 (the upward calling). The call comes from heaven and is to heaven in its appeal. Consider First aorist active imperative of κατανοεω — katanoeō old compound verb No “even” in the Greek, just like the idiom in Hebrews 2:9, the human name held up with pride. The Apostle and High Priest of our confession (Ιησουν — ton apostolon kai archierea tēs homologias hēmōn). In descriptive apposition with τον — Iēsoun and note the single article αποστολος — ton This is the only time in the N.T. that Jesus is called αποστελλω — apostolos though he often used απεστειλας — apostellō of God‘s sending him forth as in John 17:3 (αποστολος — apesteilas). This verb is used of Moses as sent by God (Exodus 3:10). Moffatt notes that πρεσβευτης — apostolos is Ionic for ομολογια — presbeutēs “not a mere envoy, but an ambassador or representative sent with powers.” The author has already termed Jesus high priest (Hebrews 2:17). For ομολογεω — homologia (confession) see 2 Corinthians 9:13; 1 Timothy 6:12. These Hebrew Christians had confessed Jesus as their Apostle and High Priest. They do not begin to understand what Jesus is and means if they are tempted to give him up. The word runs through Hebrews with an urgent note for fidelity (Hebrews 4:14; Hebrews 10:23). See ομον — homologeō (λεγω — homon same, legō say), to say the same thing, to agree, to confess, to profess. [source]
Hebrews 3:1 Partakers [μετοχοι]
See Luke 5:7 for “partners” in the fishing, elsewhere in N.T. only in Hebrews (Hebrews 1:9; Hebrews 6:4; Hebrews 12:8) in N.T. Of a heavenly calling Only here in the N.T., though same idea in Hebrews 9:15. See η ανω κλησις — hē anō klēsis in Philemon 3:14 (the upward calling). The call comes from heaven and is to heaven in its appeal. Consider First aorist active imperative of κατανοεω — katanoeō old compound verb No “even” in the Greek, just like the idiom in Hebrews 2:9, the human name held up with pride. The Apostle and High Priest of our confession (Ιησουν — ton apostolon kai archierea tēs homologias hēmōn). In descriptive apposition with τον — Iēsoun and note the single article αποστολος — ton This is the only time in the N.T. that Jesus is called αποστελλω — apostolos though he often used απεστειλας — apostellō of God‘s sending him forth as in John 17:3 (αποστολος — apesteilas). This verb is used of Moses as sent by God (Exodus 3:10). Moffatt notes that πρεσβευτης — apostolos is Ionic for ομολογια — presbeutēs “not a mere envoy, but an ambassador or representative sent with powers.” The author has already termed Jesus high priest (Hebrews 2:17). For ομολογεω — homologia (confession) see 2 Corinthians 9:13; 1 Timothy 6:12. These Hebrew Christians had confessed Jesus as their Apostle and High Priest. They do not begin to understand what Jesus is and means if they are tempted to give him up. The word runs through Hebrews with an urgent note for fidelity (Hebrews 4:14; Hebrews 10:23). See ομον — homologeō (λεγω — homon same, legō say), to say the same thing, to agree, to confess, to profess. [source]
Hebrews 3:1 Of a heavenly calling [κλησεως επουρανιου]
Only here in the N.T., though same idea in Hebrews 9:15. See η ανω κλησις — hē anō klēsis in Philemon 3:14 (the upward calling). The call comes from heaven and is to heaven in its appeal. Consider First aorist active imperative of κατανοεω — katanoeō old compound verb No “even” in the Greek, just like the idiom in Hebrews 2:9, the human name held up with pride. The Apostle and High Priest of our confession (Ιησουν — ton apostolon kai archierea tēs homologias hēmōn). In descriptive apposition with τον — Iēsoun and note the single article αποστολος — ton This is the only time in the N.T. that Jesus is called αποστελλω — apostolos though he often used απεστειλας — apostellō of God‘s sending him forth as in John 17:3 (αποστολος — apesteilas). This verb is used of Moses as sent by God (Exodus 3:10). Moffatt notes that πρεσβευτης — apostolos is Ionic for ομολογια — presbeutēs “not a mere envoy, but an ambassador or representative sent with powers.” The author has already termed Jesus high priest (Hebrews 2:17). For ομολογεω — homologia (confession) see 2 Corinthians 9:13; 1 Timothy 6:12. These Hebrew Christians had confessed Jesus as their Apostle and High Priest. They do not begin to understand what Jesus is and means if they are tempted to give him up. The word runs through Hebrews with an urgent note for fidelity (Hebrews 4:14; Hebrews 10:23). See ομον — homologeō (λεγω — homon same, legō say), to say the same thing, to agree, to confess, to profess. [source]
Hebrews 3:1 Consider [κατανοησατε]
First aorist active imperative of κατανοεω — katanoeō old compound verb No “even” in the Greek, just like the idiom in Hebrews 2:9, the human name held up with pride. The Apostle and High Priest of our confession (Ιησουν — ton apostolon kai archierea tēs homologias hēmōn). In descriptive apposition with τον — Iēsoun and note the single article αποστολος — ton This is the only time in the N.T. that Jesus is called αποστελλω — apostolos though he often used απεστειλας — apostellō of God‘s sending him forth as in John 17:3 (αποστολος — apesteilas). This verb is used of Moses as sent by God (Exodus 3:10). Moffatt notes that πρεσβευτης — apostolos is Ionic for ομολογια — presbeutēs “not a mere envoy, but an ambassador or representative sent with powers.” The author has already termed Jesus high priest (Hebrews 2:17). For ομολογεω — homologia (confession) see 2 Corinthians 9:13; 1 Timothy 6:12. These Hebrew Christians had confessed Jesus as their Apostle and High Priest. They do not begin to understand what Jesus is and means if they are tempted to give him up. The word runs through Hebrews with an urgent note for fidelity (Hebrews 4:14; Hebrews 10:23). See ομον — homologeō (λεγω — homon same, legō say), to say the same thing, to agree, to confess, to profess. [source]
1 John 5:20 We may know [γινώσκομεν]
Apprehend progressively. Compare John 17:3. [source]
1 John 5:11 Eternal life [ζωὴν αἰώνιον]
Compare the phrase τὴν ζωὴν τὴν αἰώνιον thelife, the eternal life (1 John 1:2), and ἡ αἰώνιος ζωὴ theeternal life (John 17:3). For the distinction between the phrases see on 1 John 1:2. The phrase here, without either article, merely defines the character of the life. [source]
1 John 5:3 This [αυτη]
Explanatory use of ινα — hina with αυτη — hautē as in John 17:3, to show what “the love of God” (1 John 4:9, 1 John 4:12) in the objective sense is, not mere declamatory boasting (1 John 4:20), but obedience to God‘s commands, “that we keep on keeping (present active subjunctive as in 1 John 2:3) his commandments.” This is the supreme test. [source]
1 John 1:8 The truth []
The whole Gospel. All reality is in God. He is the only true God ( ἀληθινός John 17:3; see on John 1:9). This reality is incarnated in Christ, the Word of God, “the very image of His substance,” and in His message to men. This message is the truth, a title not found in the Synoptists, Acts, or Revelation, but in the Catholic Epistles (James 5:19; 1 Peter 1:22; 2 Peter 2:2), and in Paul (2 Corinthians 8:8; Ephesians 1:13, etc.). It is especially characteristic of the Gospel and Epistles of John. The truth is represented by John objectively and subjectively. 1. Objectively. In the person of Christ. He is the Truth, the perfect revelation of God (John 1:18; John 14:6). His manhood is true to the absolute law of right, which is the law of love, and is, therefore, our perfect pattern of manhood. -DIVIDER-
-DIVIDER-
Truth, absolutely existing in and identified with God, was also, in some measure, diffused in the world. The Word was in the world, before as after the incarnation (John 1:10. See on John 1:4, John 1:5). Christ often treats the truth as something to which He came to bear witness, and which it was His mission to develop into clearer recognition and expression (John 18:37). This He did through the embodiment of truth in His own person (John 1:14, John 1:17; John 14:6), and by His teaching (John 8:40; John 17:17); and His work is carried out by the Spirit of Truth (John 16:13), sent by God and by Christ himself (John 14:26; John 16:7). Hence the Spirit, even as Christ, is the Truth (1 John 5:6). The whole sum of the knowledge of Christ and of the Spirit, is the Truth (1 John 2:21; 2 John 1:1). This truth can be recognized, apprehended, and appropriated by man, and can be also rejected by him (John 8:32; 1 John 2:21; John 8:44). -DIVIDER-
-DIVIDER-
2. Subjectively. The truth is lodged in man by the Spirit, and communicated to his spirit (John 14:17; John 15:26; John 16:13). It dwells in man (1 John 1:8; 1 John 2:4; 2 John 1:2), as revelation, comfort, guidance, enlightenment, conviction, impulse, inspiration, knowledge. It is the spirit of truth as opposed to the spirit of error (1 John 4:6). It translates itself into act. God's true children do the truth (John 3:21; 1 John 1:6). It brings sanctification and freedom (John 8:32; John 17:17). See on John 14:6, John 14:17. -DIVIDER-
-DIVIDER-
[source]

1 John 5:20 That we know [ινα γινωσκομεν]
Result clause with ινα — hina and the present active indicative, as is common with ινα — hina and the future indicative (John 7:3). It is possible that here ο — o was pronounced ω — ō as a subjunctive, but many old MSS. have ινα γινωσκουσιν — hina ginōskousin (plainly indicative) in John 17:3, and in many other places in the N.T. the present indicative with ινα — hina occurs as a variant reading as in John 5:20. [source]
1 John 5:20 An understanding [διανοιαν]
Here alone in John‘s writings, but in Paul (Ephesians 4:18) and Peter (1 Peter 1:13). John does not use γνωσις — gnōsis (knowledge) and νους — nous (mind) only in Revelation 13:18; Revelation 17:9.That we know (ινα γινωσκομεν — hina ginōskomen). Result clause with ινα — hina and the present active indicative, as is common with ινα — hina and the future indicative (John 7:3). It is possible that here ο — o was pronounced ω — ō as a subjunctive, but many old MSS. have ινα γινωσκουσιν — hina ginōskousin (plainly indicative) in John 17:3, and in many other places in the N.T. the present indicative with ινα — hina occurs as a variant reading as in John 5:20.Him that is true That is, God. Cf. 1 John 1:8.In him that is true (εν τωι αλητινωι — en tōi alēthinōi). In God in contrast with the world “in the evil one” (1 John 5:19). See John 17:3.Even in his Son Jesus Christ The αυτου — autou refers clearly to εν τωι αλητινωι — en tōi alēthinōi (God). Hence this clause is not in apposition with the preceding, but an explanation as to how we are “in the True One” by being “in his Son Jesus Christ.”This (ουτος — houtos). Grammatically ουτος — houtos may refer to Jesus Christ or to “the True One.” It is a bit tautological to refer it to God, but that is probably correct, God in Christ, at any rate. God is eternal life (John 5:26) and he gives it to us through Christ. [source]
1 John 5:20 Him that is true [τον αλητινον]
That is, God. Cf. 1 John 1:8.In him that is true (εν τωι αλητινωι — en tōi alēthinōi). In God in contrast with the world “in the evil one” (1 John 5:19). See John 17:3.Even in his Son Jesus Christ The αυτου — autou refers clearly to εν τωι αλητινωι — en tōi alēthinōi (God). Hence this clause is not in apposition with the preceding, but an explanation as to how we are “in the True One” by being “in his Son Jesus Christ.”This (ουτος — houtos). Grammatically ουτος — houtos may refer to Jesus Christ or to “the True One.” It is a bit tautological to refer it to God, but that is probably correct, God in Christ, at any rate. God is eternal life (John 5:26) and he gives it to us through Christ. [source]
1 John 5:20 In him that is true [εν τωι αλητινωι]
In God in contrast with the world “in the evil one” (1 John 5:19). See John 17:3. [source]

What do the individual words in John 17:3 mean?

This now is - eternal life that they may know You the only TRUE God and whom You have sent Jesus Christ
αὕτη δέ ἐστιν αἰώνιος ζωὴ ἵνα γινώσκωσιν σὲ τὸν μόνον ἀληθινὸν Θεὸν καὶ ὃν ἀπέστειλας Ἰησοῦν Χριστόν

αὕτη  This 
Parse: Demonstrative Pronoun, Nominative Feminine Singular
Root: οὗτος  
Sense: this.
δέ  now 
Parse: Conjunction
Root: δέ  
Sense: but, moreover, and, etc.
  - 
Parse: Article, Nominative Feminine Singular
Root:  
Sense: this, that, these, etc.
αἰώνιος  eternal 
Parse: Adjective, Nominative Feminine Singular
Root: αἰώνιος  
Sense: without beginning and end, that which always has been and always will be.
ζωὴ  life 
Parse: Noun, Nominative Feminine Singular
Root: ζωή  
Sense: life.
ἵνα  that 
Parse: Conjunction
Root: ἵνα  
Sense: that, in order that, so that.
γινώσκωσιν  they  may  know 
Parse: Verb, Present Subjunctive Active, 3rd Person Plural
Root: γινώσκω  
Sense: to learn to know, come to know, get a knowledge of perceive, feel.
μόνον  only 
Parse: Adjective, Accusative Masculine Singular
Root: μόνος  
Sense: alone (without a companion), forsaken, destitute of help, alone, only, merely.
ἀληθινὸν  TRUE 
Parse: Adjective, Accusative Masculine Singular
Root: ἀληθινός  
Sense: that which has not only the name and resemblance, but the real nature corresponding to the name, in every respect corresponding to the idea signified by the name, real, true genuine.
Θεὸν  God 
Parse: Noun, Accusative Masculine Singular
Root: θεός  
Sense: a god or goddess, a general name of deities or divinities.
ὃν  whom 
Parse: Personal / Relative Pronoun, Accusative Masculine Singular
Root: ὅς 
Sense: who, which, what, that.
ἀπέστειλας  You  have  sent 
Parse: Verb, Aorist Indicative Active, 2nd Person Singular
Root: ἀποστέλλω 
Sense: to order (one) to go to a place appointed.
Ἰησοῦν  Jesus 
Parse: Noun, Accusative Masculine Singular
Root: Ἰησοῦς  
Sense: Joshua was the famous captain of the Israelites, Moses’ successor.
Χριστόν  Christ 
Parse: Noun, Accusative Masculine Singular
Root: Χριστός  
Sense: Christ was the Messiah, the Son of God.