If the evil doings of men...

"If the evil doings of men move you to indignation and overwhelming distress, even to a desire for vengeance on the evildoers, shun above all thing that feeling. Go at once and seek suffering for yourself, as though you were yourself guilty of that wrong. Accept that suffering and bear it and your heart will find comfort, and you will understand that you too are guilty, for you might have been a light to the evildoers and were not a light to them."

- Fyodor Dostoyevsky from,

The Brothers Karamazov