The Meaning of 1 John 3:3 Explained

1 John 3:3

KJV: And every man that hath this hope in him purifieth himself, even as he is pure.

YLT: and every one who is having this hope on him, doth purify himself, even as he is pure.

Darby: And every one that has this hope in him purifies himself, even as he is pure.

ASV: And every one that hath this hope'set on him purifieth himself, even as he is pure.

KJV Reverse Interlinear

And  every man  that hath  this  hope  in  him  purifieth  himself,  even as  he  is  pure. 

What does 1 John 3:3 Mean?

Verse Meaning

In the meantime we anticipate seeing and knowing Jesus Christ fully, and that anticipation has a purifying effect on us now (cf. 1 John 2:1; 1 John 2:6; 1 John 2:29; 1 John 3:7; 1 John 3:16; 1 John 4:17; Matthew 5:8). [1] Similarly in the future seeing and knowing Christ will have a completely purifying effect on us (cf. 2 Corinthians 3:18). The believer"s hope is not "in him" (AV and NIV i.e, "within himself"), but "on Him" (NASB i.e, "set on Christ"; Gr. ep auto).
"John states two reasons why the Christian ought to be pure. One is related to a past work of God and the second to a future work." [2]

Context Summary

1 John 3:1-12 - The Marks Of God's Children
This chapter opens with one of the astounding announcements of Scripture. Why God should have made us His children is incomprehensible, except to show forth the riches of His grace. See Ephesians 2:7. That such we are is certain, but how marvelous! Yet even greater wonders await us, for we are to be like Jesus our Lord. He is the type to which we are being conformed, and on the other side we shall awake in His likeness.
He is pure; such is the verdict of one who lived in the closest possible association with Him. We cannot think of Christ, or of the future to be spent with Him, without desiring purity above all. Ask Him to become in thee the fountain of purity! If He is thy constant study, the quality of His character will become thine. Presumptuous sin is impossible under such conditions. He will destroy the works of the devil in the individual and in the universe. That we are God's own children is proved by our integrity and love. They are the hallmark of God's ownership. [source]

Chapter Summary: 1 John 3

1  He declares the singular love of God toward us, in making us his sons;
3  who therefore ought obediently to keep his commandments;
11  as also to love one another as brothers

Greek Commentary for 1 John 3:3

Set on him [επ αυτωι]
Resting upon (επι — epi) with locative rather than εις — eis looking to, Acts 24:15. That is upon Christ (Brooke), upon God (D. Smith), upon God in Christ (Westcott). [source]
Purifieth himself [αγνιζει εαυτον]
Present active indicative of αγνιζω — hagnizō old verb, from αγνος — hagnos (pure from contamination), used of ceremonial purifications (John 11:55; Acts 21:24, Acts 21:26 as in Exodus 19:10) and then of personal internal cleansing of heart (James 4:8), soul (1 Peter 1:22), self (here). Cf. Philemon 2:12. the work of both God and man.As he is pure (κατως εκεινος αγνος εστιν — kathōs ekeinos hagnos estin). As in 1 John 2:6; 1 John 3:9 εκεινος — ekeinos (emphatic demonstrative) refers to Christ. Christ can be termed αγνος — hagnos “in virtue of the perfection of his humanity” (Westcott). Our destiny is to be conformed to the image of God in Christ (Romans 8:29). [source]
As he is pure [κατως εκεινος αγνος εστιν]
As in 1 John 2:6; 1 John 3:9 εκεινος — ekeinos (emphatic demonstrative) refers to Christ. Christ can be termed αγνος — hagnos “in virtue of the perfection of his humanity” (Westcott). Our destiny is to be conformed to the image of God in Christ (Romans 8:29). [source]
Every man that hath [πᾶς ὁ ἔχων]
A characteristic form of expression with John, containing “a reference to some who had questioned the application of a general principle in particular cases.” Here to some persons who had denied the practical obligation to moral purity involved in their hope. See 1 John 3:4, 1 John 3:6, 1 John 3:9, 1 John 3:10, 1 John 3:15, 1 John 3:23, 1 John 3:24; 1 John 4:7; 1 John 5:1, 1 John 5:4, 1 John 5:18; 2 John 1:9. [source]
Hope []
John's only reference to Christian hope. The phrase used here, to have the hope upon one, is unique in the New Testament. Compare ἐπ ' αὐτῷ ἔθνη ἐλπιοῦσιν “on Him shall the Gentiles hope” (Romans 15:12): ἠλπίκαμεν ἐπὶ Θεῷ ζῶντι “we have hoped on the living God” (1 Timothy 4:10). On the force of ἔχων , see on John 16:22. [source]
In Him [ἐπ ' αὐτῷ]
Ambiguous. Better, as Rev., set on Him. [source]
Purifieth himself [ἁγνίζει ἑαυτόν]
On the verb, see on 1 Peter 1:22; see on James 4:8. In the Septuagint used only of ceremonial purification, and so four out of the seven instances in which it occurs in the New Testament (John 11:55; Acts 21:24, Acts 21:26; Acts 24:18). In the remaining cases, of purifying the heart and the soul (James 4:8; 1 Peter 1:22). The kindred adjective ἁγνός purehas a moral signification in every case, as has the noun ἁγότης pureness(only 2 Corinthians 6:6). Ἁγνισμός purification(only Acts 21:26), ceremonial. [source]
He [ἐκεῖνος]
Christ, as always in the Epistle. [source]
Pure [ἁγνός]
See above. Though marking moral and spiritual purity, and that of a very high grade, since it is applied to Christ here, yet it admits the thought of possible temptation or pollution, thus differing from ἅγιος , which means absolutely holy. Hence ἁγνός cannot properly be applied to God, who is ἅγιος ; but both may be used of Christ, the latter in virtue of His human perfection. [source]

Reverse Greek Commentary Search for 1 John 3:3

John 14:26 He [ἐκεῖνος]
Setting the Advocate distinctly and sharply before the hearers. The pronoun is used in John's First Epistle, distinctively of our Lord. See 1 John 2:6; 1 John 3:3, 1 John 3:5, 1 John 3:7, 1 John 3:16; 1 John 4:17. [source]
Philippians 4:8 Pure [ἁγνά]
See on 1 John 3:3. [source]
Philippians 1:16 Sincerely [ἁγνῶς]
Purely, with unmixed motives. The adjective ἁγνός means pure, in the sense of chaste, free from admixture of evil, and is once applied to God, 1 John 3:3. See on Acts 26:10, footnote. Not sincerely is explained by in pretense, Phlippians 1:18. [source]
1 Timothy 5:5 Trusteth in God [ἤλπικεν ἐπὶ τὸν Θεὸν]
Strictly hath directed her hope at God. Rev. hath her hope set on God implies ἐπὶ with the dative, as 1 John 3:3. [source]
1 Timothy 5:22 Keep thyself pure [σεαυτὸν ἁγνὸν τήρει]
Comp. 1 Timothy 6:14. Enjoining positively what was enjoined negatively in the preceding clause. For pure see on 1 John 3:3. For keep see on reserved, 1 Peter 1:4. The phrase ἑαυτὸν τηρεῖν to keep one's self, in James 1:27; 2 Corinthians 11:9. [source]
1 Timothy 4:12 Purity [ἁγνίᾳ]
Only here and 1 Timothy 5:2. Ἁγνός pure 1 Timothy 5:22; Titus 2:5. In Paul, 2 Corinthians 8:11; 2 Corinthians 11:2; Philemon 4:8. Also in James, Peter, and 1John. Ἁγνότης purity 2 Corinthians 6:6; 2 Corinthians 11:3. olxx, oClass. Ἁγνός always with a moral sense; not limited to sins of the flesh, but covering purity in motives as well as in acts. In 1 John 3:3, of Christ. In 2 Corinthians 11:2, of virgin purity. In James 3:17, as a characteristic of heavenly wisdom. Ἁγνῶς purely(Philemon 1:17), of preaching the gospel with unmixed motives. The verb ἁγνίζειν topurify, which in lxx is used only of ceremonial purification, has that meaning in four of the seven instances in N.T. (John 11:55; Acts 21:24, Acts 21:26; Acts 24:18). In the others (James 4:8; 1 Peter 1:22; 1 John 3:3) it is used of purifying the heart and soul. [source]
Titus 3:7 According to the hope of eternal life [κατ ' ἐλπίδα ζωῆς αἰωνίου]
Const. of eternal life with heirs, and rend. heirs of eternal life according to hope. Comp. Romans 4:18; Romans 5:2; Romans 8:24; Galatians 5:5; Colossians 1:5, Colossians 1:27; Titus 1:2; 1 Peter 1:3; 1 John 3:2, 1 John 3:3. [source]
James 4:8 Purify [ἁγνίσατε]
One of the three instances in the New Testament in which the word is not used of ceremonial purification. The others are 1 Peter 1:22; 1 John 3:3. [source]
James 4:8 Purify your hearts [αγνισατε καρδιας]
First aorist active imperative of αγνιζω — hagnizō old verb from αγνος — hagnos (James 3:17), ceremonially (Acts 21:24, Acts 21:26), but here morally as in 1 Peter 1:22; 1 John 3:3. Anarthrous use of καρδιας — kardias as of χειρας — cheiras (wash hands, purify hearts).Ye double-minded (διπσυχοι — dipsuchoi). As in James 1:8. [source]
James 4:8 Cleanse your hands [καταρισατε χειρας]
First aorist active imperative of καταριζω — katharizō to cleanse, from dirt in a ritual sense (Exodus 30:19-21; Mark 7:3, Mark 7:19). Here it is figurative, as in Isaiah 1:16; Psalm 24:4. If we always had clean (from sin) hands and hearts?Ye sinners (αμαρτωλοι — hamartōloi). A sharp term to strike the conscience, “a reproach meant to startle and sting” (Ropes).Purify your hearts First aorist active imperative of αγνιζω — hagnizō old verb from αγνος — hagnos (James 3:17), ceremonially (Acts 21:24, Acts 21:26), but here morally as in 1 Peter 1:22; 1 John 3:3. Anarthrous use of καρδιας — kardias as of χειρας — cheiras (wash hands, purify hearts).Ye double-minded (διπσυχοι — dipsuchoi). As in James 1:8. [source]
1 Peter 1:22 Purified [ἡγνικότες]
The Septuagint translation of the Old-Testament technical term for the purification of the people and priests (1 Chronicles 15:12; 1 Samuel 16:5). Also, of the separation from wine and strong drink by the Nazarite (Numbers href="/desk/?q=nu+6:2-6&sr=1">Numbers 6:2-6). In this ceremonial sense, John 11:55; Acts 21:24, Acts 21:26; Acts 24:18. In the moral sense, as here, James 4:8; 1 John 3:3. Compare καθαρίσας , purifying, Acts 15:9. [source]
1 Peter 1:22 Seeing ye have purified [ηγνικοτες]
Perfect active participle of αγνιζω — hagnizō old verb from αγνος — hagnos (pure), here with πσυχας — psuchas (souls), with καρδιας — kardias (hearts) in James 4:8 as in 1 John 3:3 of moral cleansing also. See the ceremonial sense of the word as in lxx in John 11:55; Acts 21:24, Acts 21:26; Acts 24:18. [source]
1 John 5:1 Whosoever believeth [πᾶς ὁ πιστεύων]
Lit., every one that believeth. For the characteristic form of expression see on 1 John 3:3. [source]
1 John 3:4 Whosoever committeth sin [πᾶς ὁ ποιῶν τὴν ἁμαρτίαν]
Rev., better, every one that doeth sin. See on 1 John 3:3, every man that hath, and note the frequent repetition of this form of expression in the present chapter. Compare πᾶς ὁ ἁμαρτάνων whosoeversinneth (1 John 3:6). The phrase to do sin regards sin as something actually realized in its completeness. He that does sin realizes in action the sin (note the article τὴν ) that which includes and represents the complete ideal of sin. Compare do righteousness, 1 John 2:29. [source]
1 John 1:7 Cleanseth [καθαρίζει]
See on Mark 7:19. Not only forgives but removes. Compare Titus 2:14; Hebrews 9:13sq.; Hebrews 9:22sq.; Ephesians 5:26sq.; Matthew 5:8; 1 John 3:3. Compare also 1 John 1:9, where, forgive ( ἀφῇ ) and cleanse ( καθαρίσῃ ) occur, with an obvious difference of meaning. Note the present tense cleanseth. The cleansing is present and continuous. Alexander (Bishop of Derry) cites a striking passage from Victor Hugo (“Le Parricide”). The usurper Canute, who has had a share in his father's death, expiring after a virtuous and glorious reign, walks towards the light of heaven. But first he cuts with his sword a shroud of snow from the top of Mt. Savo. As he advances towards heaven, a cloud forms, and drop by drop his shroud is soaked with a rain of blood. [source]
1 John 1:7 And the blood of Jesus his Son cleanseth us from all sin [και το αιμα Ιησου του υιου αυτου καταριζει ημας απο πασης αμαρτιας]
This clause with και — kai in true Johannine style is coordinate with the preceding one. Walking in the light with God makes possible fellowship with one another and is made possible also by the blood of Jesus (real blood and no mere phantom, atoning blood of the sinless Son of God for our sins). John is not ashamed to use this word. It is not the mere “example” of Jesus that “cleanses” us from sin. It does cleanse the conscience and life and nothing else does (Hebrews 9:13.; Titus 2:14). See in 1 John 1:9 both forgiveness and cleansing. Cf. 1 John 3:3. [source]
1 John 2:6 Even as he walked [κατως εκεινος περιεπατησεν]
Constative aorist active indicative summing up the life of Christ on earth with the emphatic use of the demonstrative εκεινος — ekeinos in reference to Christ as in 1 John 3:3, 1 John 3:5, 1 John 3:7, 1 John 3:16; 1 John 4:17; John 7:11; John 9:12, John 9:28; John 19:21. [source]
1 John 2:25 He promised [αυτος επηγγειλατο]
First aorist middle indicative of επαγγελλω — epaggellō Αυτος — Autos (he) is Christ as is seen in 1 John 3:3 by εκεινος — ekeinos f0). [source]
1 John 3:5 He [εκεινος]
As in 1 John 3:3; John 1:18. [source]
1 John 3:16 He for us [εκεινος υπερ ημων]
Εκεινος — Ekeinos as in 1 John 2:6; 1 John 3:3, 1 John 3:5, υπερ — huper here alone in this Epistle, though common in John‘s Gospel (John 10:11, John 10:15; John 11:50, etc.) and in 3 John 1:7. [source]
1 John 4:17 With us [μετ ημων]
Construed with the verb τετελειωται — teteleiōtai (is perfected). In contrast to εν ημιν — en hēmin (1 John 4:12, 1 John 4:16), emphasising cooperation. “God works with man” (Westcott). For boldness That is Christ as in 1 John 2:6; 1 John 3:3, 1 John 3:5, 1 John 3:7, 1 John 3:16. Same tense (present) as in 1 John 3:7. “Love is a heavenly visitant” (David Smith). We are in this world to manifest Christ. [source]
1 John 1:7 Of Jesus Christ His Son []
Omit Christ. The human name, Jesus, shows that His blood is available for man. The divine name, His Son, shows that it is efficacious. I shall be rendering a service to students of John's Epistles by giving, in a condensed form, Canon Westcott's note, classifying the several names of our Lord and their uses in the Epistles. The name in John, as in the Bible elsewhere, has two distinct, but closely connected meanings. -DIVIDER-
-DIVIDER-
1. The Revelation of the Divine Being by a special title. -DIVIDER-
-DIVIDER-
2. The whole sum of the manifold revelations gathered up so as to form one supreme revelation. -DIVIDER-
-DIVIDER-
The latter sense is illustrated in 3 John 1:7, where “the name” absolutely includes the essential elements of the Christian creed, the complete revelation of Christ's work in relation to God and man. Compare John 20:31; Acts 5:41. -DIVIDER-
-DIVIDER-
In 1 John 2:12, the term is more limited, referring to Christ as He lived on earth and gave Himself for “the brethren.” In 1 John 3:23; 1 John 5:13, the exact sense is defined by what follows. -DIVIDER-
-DIVIDER-
-DIVIDER-
Actual Names Used. -DIVIDER-
-DIVIDER-
(I.) His Son Jesus Christ. 1 John 1:3; 1 John 3:23; 1 John 5:20. The divine antecedent is differently described in each case, and the difference colors the phrase. In 1 John 1:2-3, the Father (compare 1John href="/desk/?q=1jo+3:23&sr=1">1 John 3:23, God. In 1 John 5:20, He that is true. Thus the sonship of Christ is regarded in relation to God as Father, as God, and as satisfying the divine ideal which man is able to form. The whole phrase, His Son Jesus Christ, includes the two elements of the confessions which John makes prominent. -DIVIDER-
-DIVIDER-
1. Jesus is the Son of God (John 4:15; John 5:5). -DIVIDER-
-DIVIDER-
2. Jesus is the Christ (John 2:22; John 5:1). -DIVIDER-
-DIVIDER-
-DIVIDER-
The constituents of the compressed phrase are all used separately by John. -DIVIDER-
-DIVIDER-
(1.) Jesus. 1 John 2:22; 1 John 5:1; 1 John 4:3(where the correct reading omits Christ). The thought is that of the Lord in His perfect historic humanity. -DIVIDER-
-DIVIDER-
(2.) Christ. 2 John 1:9. Pointing to the preparation made under the old covenant. -DIVIDER-
-DIVIDER-
(3). Jesus Christ. 1 John 2:1; 1 John 5:6; 2 John 1:7. Combining the ideas of true humanity and messianic position. -DIVIDER-
-DIVIDER-
In 1 John 4:15, the reading is doubtful: Jesus or Jesus Christ. -DIVIDER-
-DIVIDER-
On 1 John 4:2, see note. -DIVIDER-
-DIVIDER-
(4.) The Son. 1 John 2:22, 1 John 2:23, 1 John 2:24; 1 John 4:14; 1 John 5:12. The absolute relation of Sonship to Fatherhood. -DIVIDER-
-DIVIDER-
(5.) The Son of God. 1 John 3:8; 1 John 5:10, 1 John 5:12, 1 John 5:13, 1 John 5:20. Compare His Son (1 John 4:10; 1 John 5:9), where the immediate antecedent is ὁ Θεός Godand 1 John 5:18, He that was begotten of God. Combination of the ideas of Christ's divine dignity and divine sonship. -DIVIDER-
-DIVIDER-
(6.) Jesus His (God's) Son. 1 John 1:7. Two truths. The blood of Christ is available and efficacious. -DIVIDER-
-DIVIDER-
(7). His (God's) Son, His only Son. 1 John 4:9. The uniqueness of the gift is the manifestation of love. -DIVIDER-
-DIVIDER-
The Son in various forms is eminently characteristic of the First and Second Epistles, in which it occurs more times than in all Paul's Epistles. -DIVIDER-
-DIVIDER-
Κύριος Lordis not found in the Epistles (omit from 2 John 1:3), but occurs in the Gospel, and often in Revelation. -DIVIDER-
-DIVIDER-
-DIVIDER-
The expression, the blood of Jesus His Son, is chosen with a profound insight. Though Ignatius uses the phrase blood of God yet the word blood is inappropriate to the Son conceived in His divine nature. The word Jesus brings out His human nature, in which He assumed a real body of flesh and blood, which blood was shed for us.Cleanseth ( καθαρίζει )See on Mark 7:19. Not only forgives but removes. Compare Titus 2:14; Hebrews 9:13sq.; Hebrews 9:22sq.; Ephesians 5:26sq.; Matthew 5:8; 1 John 3:3. Compare also 1 John 1:9, where, forgive ( ἀφῇ ) and cleanse ( καθαρίσῃ ) occur, with an obvious difference of meaning. Note the present tense cleanseth. The cleansing is present and continuous. Alexander (Bishop of Derry) cites a striking passage from Victor Hugo (“Le Parricide”). The usurper Canute, who has had a share in his father's death, expiring after a virtuous and glorious reign, walks towards the light of heaven. But first he cuts with his sword a shroud of snow from the top of Mt. Savo. As he advances towards heaven, a cloud forms, and drop by drop his shroud is soaked with a rain of blood.All sin ( πάσης ἁμαρτίας )The principle of sin in all its forms and manifestations; not the separate manifestations. Compare all joy (James 1:2); all patience (2 Corinthians 7:12); all wisdom (Ephesians 1:8); all diligence (2 Peter 1:5). [source]

1 John 1:7 As he [ως αυτος]
As God is light (1 John 1:5) and dwells in light unapproachable (1 Timothy 6:16).One with another (μετ αλληλων — met' allēlōn). As he has already said in 1 John 1:3. But we cannot have fellowship with one another unless we have it with God in Christ, and to do that we must walk in the light with God.And the blood of Jesus his Son cleanseth us from all sin This clause with και — kai in true Johannine style is coordinate with the preceding one. Walking in the light with God makes possible fellowship with one another and is made possible also by the blood of Jesus (real blood and no mere phantom, atoning blood of the sinless Son of God for our sins). John is not ashamed to use this word. It is not the mere “example” of Jesus that “cleanses” us from sin. It does cleanse the conscience and life and nothing else does (Hebrews 9:13.; Titus 2:14). See in 1 John 1:9 both forgiveness and cleansing. Cf. 1 John 3:3. [source]
1 John 4:17 As he is [κατως εκεινος εστιν]
That is Christ as in 1 John 2:6; 1 John 3:3, 1 John 3:5, 1 John 3:7, 1 John 3:16. Same tense (present) as in 1 John 3:7. “Love is a heavenly visitant” (David Smith). We are in this world to manifest Christ. [source]
1 John 3:16 Love [την αγαπην]
“The thing called love” (D. Smith).He for us (εκεινος υπερ ημων — ekeinos huper hēmōn). Εκεινος — Ekeinos as in 1 John 2:6; 1 John 3:3, 1 John 3:5, υπερ — huper here alone in this Epistle, though common in John‘s Gospel (John 10:11, John 10:15; John 11:50, etc.) and in 3 John 1:7.Laid down his life First aorist active indicative of τιτημι — tithēmi the very idiom used by Jesus of himself in John 10:11, John 10:17.We ought (ημεις οπειλομεν — hēmeis opheilomen). Emphatic ημεις — hēmeis again. For οπειλω — opheilō see 1 John 2:6. Of course our laying down our lives for the brethren has no atoning value in our cases as in that of Christ, but is a supreme proof of one‘s love (John 13:37.; John 15:13), as often happens. [source]
2 John 1:9 Whosoever transgresseth [πᾶς ὁ παραβαίνων]
The best texts read προάγων goethonward. So Rev., with taketh the lead in margin. The meaning is, whosoever advances beyond the limits of Christian doctrine. Others explain of those who would set themselves up as teachers, or take the lead. Such false progress is contrasted with abiding in the teaching. On the construction, πᾶς everyone, with the article and participle, see on 1 John 3:3. [source]
Revelation 19:7 Is come [ηλτεν]
Prophetic aorist, come at last.Made herself ready (ητοιμασεν εαυτην — hētoimasen heautēn). First aorist active indicative of ετοιμαζω — hetoimazō and the reflexive pronoun. See Revelation 22:2 for ητοιμασμενην ως νυμπην — hētoimasmenēn hōs numphēn (prepared as a bride). There is something for her to do (1 John 3:3; Judges 1:21; 2 Corinthians 7:1), but the chief preparation is the act of Christ (Ephesians 5:25.). [source]
Revelation 19:7 Let us give [δωμεν]
Second aorist active subjunctive of διδωμι — didōmi but A reads δωσομεν — dōsomen (future active) and P δωσωμεν — dōsōmen If the future indicative is read, the tone is changed from exhortation to declaration (we shall give glory unto him).The marriage of the Lamb (ο γαμος του αρνιου — ho gamos tou arniou). In the O.T. God is the Bridegroom of Israel (Hosea 2:16; Isaiah 54:6; Ezekiel 16:7.). In the N.T. Christ is the Bridegroom of the Kingdom (the universal spiritual church as seen by Paul, 2 Corinthians 11:2; Ephesians 5:25., and by John in Revelation 3:20; Revelation 19:7, Revelation 19:9; Revelation 21:2, Revelation 21:9; Revelation 22:17. In the Gospels Christ appears as the Bridegroom (Mark 2:19.; Matthew 9:15; Luke 5:34.; John 3:29). The figure of γαμος — gamos occurs in Matthew 22:2-14. Three metaphors of women appear in the Apocalypse (the Mother in chapter Rev 12, the Harlot in Rev 17-19, and the Bride of Christ here to the end). “The first and third present the Church under two different aspects of her life, while the second answers to her great rival and enemy” (Swete).Is come Prophetic aorist, come at last.Made herself ready (ητοιμασεν εαυτην — hētoimasen heautēn). First aorist active indicative of ετοιμαζω — hetoimazō and the reflexive pronoun. See Revelation 22:2 for ητοιμασμενην ως νυμπην — hētoimasmenēn hōs numphēn (prepared as a bride). There is something for her to do (1 John 3:3; Judges 1:21; 2 Corinthians 7:1), but the chief preparation is the act of Christ (Ephesians 5:25.). [source]
Revelation 19:7 Made herself ready [ητοιμασεν εαυτην]
First aorist active indicative of ετοιμαζω — hetoimazō and the reflexive pronoun. See Revelation 22:2 for ητοιμασμενην ως νυμπην — hētoimasmenēn hōs numphēn (prepared as a bride). There is something for her to do (1 John 3:3; Judges 1:21; 2 Corinthians 7:1), but the chief preparation is the act of Christ (Ephesians 5:25.). [source]

What do the individual words in 1 John 3:3 mean?

And everyone - having the hope this in Him purifies himself just as He pure is
καὶ πᾶς ἔχων τὴν ἐλπίδα ταύτην ἐπ’ αὐτῷ ἁγνίζει ἑαυτὸν καθὼς ἐκεῖνος ἁγνός ἐστιν

πᾶς  everyone 
Parse: Adjective, Nominative Masculine Singular
Root: πᾶς  
Sense: individually.
  - 
Parse: Article, Nominative Masculine Singular
Root:  
Sense: this, that, these, etc.
ἐλπίδα  hope 
Parse: Noun, Accusative Feminine Singular
Root: ἐλπίς  
Sense: expectation of evil, fear.
ταύτην  this 
Parse: Demonstrative Pronoun, Accusative Feminine Singular
Root: οὗτος  
Sense: this.
ἁγνίζει  purifies 
Parse: Verb, Present Indicative Active, 3rd Person Singular
Root: ἁγνίζω  
Sense: ceremonially.
ἑαυτὸν  himself 
Parse: Reflexive Pronoun, Accusative Masculine 3rd Person Singular
Root: ἑαυτοῦ  
Sense: himself, herself, itself, themselves.
καθὼς  just  as 
Parse: Adverb
Root: καθώς  
Sense: according as.
ἁγνός  pure 
Parse: Adjective, Nominative Masculine Singular
Root: ἁγνός  
Sense: exciting reverence, venerable, sacred.