3:3 born again. The vital doctrine of regeneration, or the new birth, has been applicable in all ages, for man by nature is a lost sinner, and must be reborn spiritually through faith in God and His promises if he is to be saved. Note, for example, such Old Testament Scriptures as Isaiah 1:18; Psalm 51:10; Ezekiel 18:31. Nevertheless, this vital doctrine is crystallized and clarified and individualized more in the New Testament, especially in this chapter. See also II Corinthians 5:17; Galatians 6:15; Colossians 3:10; Titus 3:5; I Peter 1:23; and other New Testament verses on the new birth.

3:3 kingdom of God. Because of the preaching of John the Baptist that “the kingdom of God is at hand” (e.g., Mark 1:15), Nicodemus had undoubtedly been studying the Biblical promises of the kingdom—perhaps such passages as Isaiah 9:6-7; Zechariah 14:9; Daniel 7:13-14; Psalm 72:1, 7-11; as well as others. But now he is surprised to hear Jesus say that one cannot even see that kingdom without being born again!

3:7 Ye. Jesus did not say “they” or “we,” but “ye.” He himself did not require a new birth, for He was not born with the sin nature nor did He ever commit sin. Even godly, righteous, scholarly Nicodemus must be born again, and therefore so must every other individual.