I like a lot of quotes, so it's hard to pick anything.. But this one story I remember reading when I was younger sort of struck me, and I'm not sure why. It's from the Yogacara Bhumi Sutra.
Quote:
"Some children were playing beside a river. They made castles of sand, and each child defended his castle and said, 'This one is mine.' They kept their castles separate and would not allow any mistakes about which was whose. When the castles were all finished, one child kicked over someone else's castle and completely destroyed it. The owner of the castle flew into a rage, pulled the other child's hair, struck him with his fist and bawled out, 'He has spoiled my castle! Come along all of you and help me to punish him as he deserves.' The others all came to his help. They beat the child with a stick and then stamped on him as he lay on the ground. . . . Then they went on playing in their sand castles, each saying, 'This is mine; no one else may have it. Keep away! Don't touch my castle!' But evening came; it was getting dark and they all thought they ought to be going home. No one now cared what became of his castle. One child stamped on his, another pushed his over with both hands. Then they turned away and went back, each to his home."
Then, of course, there's one of the truest lines of Buddhism: "Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense."