fool. Hebrew. kesil. See note on Proverbs 1:7.
mind. spirit. Hebrew. ruach. Put by Figure of speech Metonymy (of Cause), App-6, for the feeling manifested by it.
keepeth it. Illustrations: Abraham (Genesis 22); Joseph (Pro 42:7. Pro 44:18-34); Moses (Exodus 3:10. Compare Proverbs 4:18); Nathan (2 Samuel 12:1-6; 2 Samuel 12:7-13).