If you are not currently living a life of inner peace, then your thoughts must be wrong on some level.
When someone stabs you in the back and then apologizes, accept the apology, but don't give him the knife back to do it again!
Speak to people in a way that if they died the next day, you’d be satisfied with the last thing you said to them.
Never respond to an angry person with a fiery comeback, even if he deserves it...Don't allow his anger to become your anger.