NET

11 For who among men knows the things of a man except the man’s spirit within him? So too, no one knows the things of God except the Spirit of God.

Darby

11 For who of men hath known the things of a man^D8223 except the spirit of the man which is in him? thus also the things of God knows no one except the Spirit of God.

Darby Bible Notes

man - 'Man' here has the article, but the sense is this. what is in man's mind is not known of any but the spirit of the man himself, who has the thoughts; much more is it so with God.

KJV

11 For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.