20 For there is not a just man on earth who does good and does not sin.
21 Also do not take to heart everything people say, lest you hear your servant cursing you.
22 For many times, also, your own heart has known that even you have cursed others.
It is a universal truth (v.20)—No one is without sin (1 Kings 8:46; Proverbs 20:9; Isaiah 64:6; Romans 3:23; 5:12).
We should not be concerned with what others say about us, but only with what God says about us (1 Corinthians 4:3-5).
[Wisdom] is needed because we are all guilty of sin. Only wisdom can lead a man to profit in the presence of this universal malady. Wisdom will aid in the establishment of self-control, which will keep man from being overly offended when he observes sin in the lives of others or when he is victimized by the sins of others. When he is maligned by others, wisdom teaches him that he has maligned as well, and therefore he does not allow the words of others to detract him from his major objective, the practice of that wisdom which leads to profit. — KJV Commentary, page 747.
