Something I forgot to mention in the blog on revenge:

It’s also a good practice that, if you have a desire to avenge yourself, to offer the person a chance for your mercy. This gives the person in question the opportunity to right their wrongs, remedy their ills, and apologize to try to make things right.

This is not always the case, however, but if you ARE going to take revenge, you might as well be as noble about it as possible.