1 Corinthians 2:11

With us, however, the Son alone knows the Father, and has Himself unfolded "the Father's bosom." He has also heard and seen all things with the Father; and what He has been commanded by the Father, that also does He speak. And it is not His own will, but the Father's, which He has accomplished, which He had known most intimately, even from the beginning. "For what man knoweth the things which be in God, but the Spirit which is in Him? " But the Word was formed by the Spirit, and (if I may so express myself) the Spirit is the body of the Word.

He shows the perfect knowledge of the Spirit in the subsequent words as well. For just as the human spirit knows what is in man, so, he says, the Spirit of God knows what belongs to God. From this we learn, among other things, that …

When our mind has been filled with all these intellectual lights, it is inhabited by the divine Wisdom as a house of God, having been made a daughter of God, a spouse and friend; having been made a member of Christ the Head, a sister …

As it is written, For what man knoweth the things of a man, save the spirit of man which is in him? On what principle is it said here, Behold I know your thoughts? But the spirit of a man is then unknown to another, when it is not shewn forth either by words or deeds. For whereas it is written, Wherefore by their fruits ye shall know them; it is by the thing that is done outwardly that whatever lies concealed within is brought to sight. Whence too it is rightly said by Solomon, As in water the faces of beholders shine bright, so the hearts of men are plain to the wise.

Then when he says, for what person knows, he proves what he had said of the Spirit of God by a comparison with man's spirit, saying: For what person knows a man's thoughts, i.e., which are hidden in his heart, but the spirit of the …

We cannot know them at all till he had proposed them objectively (as it is called) in the external revelation; we cannot know or believe them to salvation till he enlightens the faculty, opens the eye of the mind, and gives us such a knowledge and faith of them.

For what man knoweth the things of a man,....

This proves the impossibility of any knowing the things of God, save by the Spirit of God (who alone knows them, since even in the case of man, so infinitely inferior in mind to God, none of his fellow men, but his own spirit alone knows the things hidden within him).

For what man knoweth the things of a man - The word ανθρωπων in the first clause is omitted by the Codex Alexandrinus, and one other; and by Athanasius, Cyril, and Vigil of Tapsus. Bishop Pearce contends strongly against the authenticity of the word, and reads the passage thus: “For what is there that knoweth the things of a man, except the spirit of a man that is in him?” “I leave out,” says the learned bishop, “ανθρωπων, with the Alexandrian MS., and read τις γαρ οιδεν τα του ανθρωπου; because I conceive that the common reading is wide of St. Paul’s meaning; for to say, What man except the spirit of a man, is (I think) to speak improperly, and to suppose that the spirit of a man is a man; but it is very proper to say, What except the spirit of a man: τις is feminine as well as masculine, and therefore may be supplied with ουσια, or some such word, as well as with ανθρωπος.” Though the authority for omitting this word is comparatively slender, yet it must be owned that its omission renders the text much more intelligible. But even one MS. may preserve the true reading. The spirit of a man knows the things of a man: that is, a man is conscious of all the schemes, plans, and purposes, that pass in his own mind; and no man can know these things but himself. So, the Spirit of God, He whom we call the Third Person of the glorious Trinity, knows all the counsels and determinations of the Supreme Being. As the Spirit is here represented to live in God as the soul lives in the body of a man, and as this Spirit knows all the things of God, and had revealed those to the apostles which concern the salvation of the world, therefore what they spoke and preached was true, and men may implicitly depend upon it. The miracles which they did, in the name of Christ, were the proof that they had that Spirit, and spoke the truth of God.