Commentaries:
Jamieson, Fausset, and Brown
That which is born, etc.—A great universal proposition; "That which is begotten carries within itself the nature of that which begat it" [OLSHAUSEN].
flesh—Not the mere material body, but all that comes into the world by birth, the entire man; yet not humanity simply, but in its corrupted, depraved condition, in complete subjection to the law of the fall (Romans 8:1-9). So that though a man "could enter a second time into his mother's womb and be born," he would be no nearer this "new birth" than before (Job 14:4; Psalms 51:5).
is spirit—"partakes of and possesses His spiritual nature."
Other Jamieson, Fausset, and Brown entries containing John 3:6:
Job 33:25-28
Song of Solomon 3:4
Matthew 10:41
1 Corinthians 15:48
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