9 Don't repay evil for evil. Don't retaliate with insults when people insult you. Instead, pay them back with a blessing. That is what God has called you to do, and he will grant you his blessing. 10 For the Scriptures say, "If you want to enjoy life and see many happy days, keep your tongue from speaking evil and your lips from telling lies. 11 Turn away from evil and do good. Search for peace, and work to maintain it. 12 The eyes of the Lord watch over those who do right, and his ears are open to their prayers. But the Lord turns his face against those who do evil."
Matthew Henry's Commentary on 1 Peter 3:9-12
Commentary on 1 Peter 3:8-13
(Read 1 Peter 3:8-13)
Though Christians cannot always be exactly of the same mind, yet they should have compassion one of another, and love as brethren. If any man desires to live comfortably on earth, or to possess eternal life in heaven, he must bridle his tongue from wicked, abusive, or deceitful words. He must forsake and keep far from evil actions, do all the good he can, and seek peace with all men. For God, all-wise and every where present, watches over the righteous, and takes care of them. None could or should harm those who copied the example of Christ, who is perfect goodness, and did good to others as his followers.