Reaping what you sow!!!
Yes what you reap you will sow.
If you plant corn would you get mangoes?
When you "get even" with a person.....if makes you no better than they are. Some-one else on the outside will look at you with just the same impression of the "bad" person. In reality we will say, "But I'm not a bad person, I'm a good person. They are the bad ones!"