"Nothing outside yourself can cause any trouble. You yourself make the waves in your mind. If you leave your mind as it is, it will become calm."
-Shunryu Suzuki

"You cannot prevent the bird of sorrow flying over your head, but you can prevent it from nesting in your hair." 
-Chinese Proverb

"Never by hatred is hatred appeased, but it is appeased by kindness. This is an eternal truth." 

-Gautama Buddha