9 Do not return evil for evil or reviling for reviling; but on the contrary bless, for to this you have been called, that you may obtain a blessing. 10 For "He that would love life and see good days, let him keep his tongue from evil and his lips from speaking guile; 11 let him turn away from evil and do right; let him seek peace and pursue it. 12 For the eyes of the Lord are upon the righteous, and his ears are open to their prayer. But the face of the Lord is against those that 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.