Whisper to the Wind

How far is too far? Is it when someone tells you you've gone too far? Is it when it becomes all you can think about? Or is it when it fills you up inside, leaving anger and hate and becoming all that you are and all that you have when others leave. You begin to depend on it and it only fuels your need for revenge.
How far would you be willing to go to exact revenge on those who murdered your family and brought the destruction of an entire village? Some say they would be willing to do anything to bring justice to them, but what if there was a road block? Something that stopped you from continuing and made you think if it was worth the anger and hate? Something that was there when all others were not and was more powerful and more dangerous than anger?
How far is too far? Or should I say, how do you know when you need to stop?