Jesus did not speak a message that He had devised but one that He had received from the Father (cf. Deuteronomy 18:18-19). What God had commanded Him to say resulted in eternal life for those who believed it. Consequently Jesus was careful to convey this message exactly as He had received it. [source][source][source]
This exhortation explains what John recorded of Jesus" public ministry. [source][source][source]
"The great subject of chap12is the meaning of the death and resurrection of Jesus." [1][source]