No Regrets

This has always been on my mind, and the story sums it all.
The Warrior knows an old saying : "If regrets could kill."
And he knows that regrets can kill; they slowly eat away at the soul of someone who has done something wrong and they lead eventually to self-destruction. The Warrior does not want to die like that. When he acts perversely or maliciously - because he is a man of many faults - he is never too ashamed to ask forgiveness. If possible, he does his best to repair the wrong he has done. If the injured party is dead, then he does some good turn to a stranger and offers up that deed to the soul that he wounded. A Warrior of the Light has no regrets, because regrets can kill. He humbles himself and undoes the wrong he has done.
Paulo Coelho's The Warrior of The Light