A very important point. I too had a very bad, violent, temper when I was young, that lead me to taking the use of my fists as the primary method of solving disagreements.
Thankfully my father knocked that out of me with properly measured and delivered discipline (sorry for all those that think that physical punishment teaches the wrong lessons - sometimes it doesn't).
Since the damage caused by my bike accident, I have the twin problems that the temper is back (not as bad but still not good) tied with the fact that I only have one good arm. So I really have to make sure I keep that anger in check or I'll end up writing a cheque that my body can no longer cash.