Repay no one evil for evil, but give thought to do what is honorable in the sight of all. If possible, so far as it depends on you, live peaceably with all. Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, “Vengeance is mine, I will repay, says the Lord.” To the contrary, “if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head.” Do not be overcome by evil, but overcome evil with good.
Romans 12:17-21 English Standard Version (ESV)
We have all heard it said that "two wrongs don't make a right." The Golden Rule is to "do unto others as you would HAVE them do unto you" (Matthew 7:12). Those who claim Jesus Christ as Lord are to always remember that we are not called to vengeance. That's God's business and He doesn't need our help taking care of His business. As we follow Christ, we are to be above the evil that surrounds us and not be drawn into behavior that exemplifies it. Living peacefully with our fellow man means we must always try to take the high road. Having the last word on a subject will sometimes require just being quiet. Silence can speak volumes.
Overcoming evil with good wins every time because it pleases God. He has the last word in every situation and when we let Him have His way we are left with the peace He promises that will surpass the understanding of those who seek to harm us. A smile can completely throw a frown off course. Love will always trump hate. Why should we forfeit our joy because someone else is miserable? Love conquers hate.
When we begin to have feelings like "don't get mad, get even," those who follow Christ are not to do either. We can just leave it to God. When we are tempted to even the score with someone who has done us wrong, we can treat them as if they are hungry and offer them something to eat. Those growling sounds we hear from them may simply be coming from an empty stomach. We can trust God to handle the evil. It is He who will repay.
“No weapon that is formed against you will prosper.” Isaiah 54:17