Some people get angry because God put thorns on roses, while others praise him for putting roses among thorns.

A magician pulls rabbits out of hats. An experimental psychologist pulls habits out of rats.

Bite off more than you can chew, then chew it. Plan more than you can do, then do it.

Experience is a hard teacher. She gives the test first and the lessons afterwards.

Experience is what causes a person to make new mistakes instead of old ones.

Philosophy is a game with objectives and no rules. Mathematics is a game with rules and no objectives.

Great minds think alike, and fools seldom differ.