Proverbs 18:14
The spirit of a man will sustain his infirmity; but a wounded spirit who can bear?
Torrey's Topical Textbook—AKJV

Proverbs 20:17
Bread of deceit is sweet to a man; but afterwards his mouth shall be filled with gravel.
Torrey's Topical Textbook—AKJV

1 Corinthians 2:11
For what man knows the things of a man, save the spirit of man which is in him? even so the things of God knows no man, but the Spirit of God.
Torrey's Topical Textbook—AKJV