“Every sentence I utter must be understood not as an affirmation but as a question.[A caution he gives his students, to b...”

“Most people would die sooner than think in fact they do.”

“In a republican nation, whose citizens are to be led by reason and persuasion and not by force, the art of reasoning bec...”

“Reason respects the differences and imagination the similitudes of things.”

“We shall require a substantially new manner of thinking if mankind is to survive.”

“Too often we . . . enjoy the comfort of opinion without the discomfort of thought.”

“The simplest questions are the most difficult.”

“The task of the real intellectual consists of analyzing illusions in order to discover their causes.”

“...there is no explaining anything by reasoning and so it is useless to reason.”

“Take away paradox from the thinker and you have a professor.”

“The only means of strengthening one's intellect is to make up one's mindabout nothing -- to let the mind be a thoroughfa...”

“I pass with relief from the tossing sea of Cause and Theory to the firm ground of Result and Fact.”