"Wicked people want to hurt people. They are digging a deep hole for people to fall into. But they fall into the hole themselves!" (Psalms 7:15 Easy)
Revenge may seem sweet, but the aftermath is dangerous. It's never advised that we try to 'get back' at someone for something they did to us. There are always consequences for evil acts of retaliation.
What a person fails to realize is that they are digging a pit for themselves. It's been said that when you dig a pit for someone else, dig another for yourself.
In the book of Esther, we see the outcome of Haman who hated Mordecai because he refuses to bow down to him. Haman in his wrath went home and told his family and he built a Gallo to hang Mordecai on. His plot failed. God says, what a man sows he will reap (Galatians 6:7). When Esther tells the matter to the king and who it was that put it in motion, the king had that man, Haman, hung on the very Gallos he built for Mordecai.
When Daniel's accusers caused him to be thrown into a den of lions because he was found praying and didn't honor the king's decree, which was set in place with evil intent, their plan also failed. God quieted those lions by squelching their hunger and they left Daniel alone. What were the consequences for such an evil act? Daniel's accusers along with their wives and children were thrown to the very same lions and were mauled and eaten before they hit the ground.
In situations where someone does you wrong, or any evil act, leave them to God. It's only a matter of time and they will experience the same thing happening to them. Charles Stanley said, "we reap what we sow, more than we've sown and for longer than we've sown it." That is scary!
Ultimately, revenge is not sweet after all. It comes with a price tag that most are not willing to pay.