And he told how one can be born again
John 3:14–15 (KJV 1900) — 14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: 15 That whosoever believeth in him should not perish, but have eternal life.
as had John
John 1:12 (KJV 1900) — 12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
(5) The “children of God.”—Those who are “begotten of God” are ipso facto “children of God” (tékna theoú,
Jn 1:12;
11:52;
1 Jn 3:1,
2,
10;
5:2).1
1 R. Law,
“Johannine, Theology, The,” ed. James Orr et al., The International Standard Bible Encyclopaedia (Chicago: The Howard-Severance Company, 1915), 1703.
CHILDREN OF GOD. Persons in this category are only those who of the fallen race are regenerated as a result of faith in Christ1
1 Merrill F. Unger,
“Children of God,” ed. R.K. Harrison, The New Unger’s Bible Dictionary (Chicago: Moody Press, 1988).
Children of God (tekna theou). In the full spiritual sense, not as mere offspring of God true of all men (Acts 17:28). Paul's phrase huioi theou (Galatians 3:26) for believers, used also by Jesus of the pure in heart (Matthew 5:9), does not occur in John's Gospel (but in Rev. 21:7). It is possible that John prefers ta tekna tou theou for the spiritual children of God whether Jew or Gentile (John 11:52) because of the community of nature (teknon from root tek-, to beget). But one cannot follow Westcott in insisting on "adoption" as Paul's reason for the use of huioi since Jesus uses huioi theou in Matthew 5:9. Clearly the idea of regeneration is involved here as in John 3:3.
Word Pictures in the New Testament.
Vincent agrees
Sons (τέκνα)
Rev., more correctly, children. Son is υἱός. Τέκνον, child (τίκτω, to bring forth), denotes a relation based on community of nature
Word Studies in the New Testament.
τέκνα θ. γενέσθαι] The spiritual life owes its beginning to a birth from above, ch. 3:3–7. And this birth is owing to the Holy Spirit of God; so that this is equivalent to saying, ‘As many as received Him, to them gave He His Holy Spirit.’ And we find that it was so: see Acts 10:44.
Henry Alford, Alford’s Greek Testament: An Exegetical and Critical Commentary (vol. 1; Grand Rapids, MI: Guardian Press, 1976), 684.