John Chrysostom — as excerpted in the Catena Aurea on John 3:4-8

“(Hom. xxvi. in Joan. 1) Do not look then for any material production, or think that the Spirit generates flesh; for even the Lord’s flesh is generated not by the Spirit only, but also by the flesh. That which is born of the Spirit is spiritual. The birth here spoken of takes place not according to our substance, but according to honour and grace. But the birth of the Son of God is otherwise; for else what would He have been more than all who are born again? And He would be proved too inferior to the Spirit, inasmuch as His birth would be by the grace of the Spirit. How does this differ from the Jewish doctrine?—But mark next the part of the Holy Spirit, in the divine work. For whereas above some are said to be born of God, (c. 1:13.) here, we find, the Spirit generates them.—The wonder of Nicodemus being roused again by the words, He who is born of the Spirit is spirit, Christ meets him again with an instance from nature; Marvel not that I said unto thee, Ye must be born again. The expression, Marvel not, shews that Nicodemus was surprised at His doctrine. He takes for this instance some thing, not of the grossness of other bodily things, but still removed from the incorporeal nature, the wind; The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit. That is to say, if no one can restrain the wind from going where it will; much less can the laws of nature, whether the condition of our natural birth, or any other, restrain the action of the Spirit. That He speaks of the wind here is plain, from His saying, Thou hearest the sound thereof, i. e. its noise when it strikes objects. He would not in talking to an unbeliever and ignorant person, so describe the action of the Spirit. He says, Bloweth where it listethc; not meaning any power of choice in the wind, but only its natural movements, in their uncontrolled power. But canst not tell whence it cometh or whither it goeth; i. e. If thou canst not explain the action of this wind which comes under the cognizance both of thy feeling and hearing, why examine into the operation of the Divine Spirit? He adds, So is every one that is born of the Spirit.”