I must fight.

You bear your wrongs more quietly than I can bear mine. I tell you that if I took my wrongs in any other way, I should be driven mad! It is only by resenting them, and by revenging them in my mind, and by angrily demanding the justice I never get, that I am able to keep my wits together. It is only that! You may tell me that I over-excite myself. I answer that it's in my nature to do it, under wrong, and I must do it.