"I doubt if a single individual could be found from the whole of mankind free from some form of insanity. The only difference is one of degree. A man who sees a gourd and takes it for his wife is called insane because this happens to very few people."

"When I get a little money I buy books; and if any is left I buy food and clothes."

"Prevention is better than cure."

"Nowadays the rage for possession has got to such a pitch that there is nothing in the realm of nature, whether sacred or profane, out of which profit cannot be squeezed."

"Sin, guilt, neurosis they are one and the same, the fruit of the tree of knowledge."

"Strength does not come from winning, but from knowing that the river of time shapes the stones of destiny."

"To question with sincerity is the first step toward dismantling dogma. Such is the immutable nature of understanding — an essential principle for the reflective life."

"Parents are the last people on earth who ought to have children."