The Lord knoweth the thoughts of man. Not only does the Almighty see and know all the actions of men (Psalms 94:9), but he is even acquainted with their thoughts (comp. Psalms 7:9; Psalms 26:2; Psalms 139:17; Isaiah 66:18; 1 Corinthians 3:20).
That they are vanity (comp. Ecclesiastes 2:14, Ecclesiastes 2:15).