The science of psychology has been far more successful on the negative than on the positive side… It has revealed to us much about man’s shortcomings, his illnesses, his sins, but little about his potentialities, his virtues, his achievable aspirations, or his psychological health.

If we listened to our intellect, we’d never have a love affair. We’d never have a friendship. We’d never go into business, because we’d be cynical. Well, that’s nonsense. You’ve got to jump off cliffs all the time and build your wings on the way down.