For what man knoweth the things of a man, but the spirit of a man that is in him? So the things also that are of God no man knoweth, but the Spirit of God.
Gregory the Great
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.
Imported from an open dataset — not yet checked against the printed edition.