Commentaries:
Jamieson, Fausset, and Brown
what man, etc.--literally, "who of men knoweth the things of a man, save the spirit of that man?"
things of God knoweth no man--rather, "none knoweth," not angel or 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).
Other commentary entries containing this verse:
Proverbs 20:27
John 1:14
1 Corinthians 2:12
2 Corinthians 6:6
1 Timothy 3:16
Revelation 19:12
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.