Ecclesiastes 1:18 - For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.

Ecclesiastes 4:3 - Yea, better is he than both they, which hath not yet been, who hath not seen the evil work that is done under the sun.

Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man. (Ecclesiastes 12:13)