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

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

“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.”

“Stupidity lies in wanting to draw conclusions.”

“A long habit of not thinking a thing wrong gives it a superficial appearance of being right.”

“This is one of those cases in which the imagination is baffled by the facts.”

“It is difficult to describe paths of thought where there are already many paths laid down, and not fall into one of the...”

“When a question has no correct answer, there is only one honest response.The gray area between yes and no.Silence.”

“You take the words in the sense which is most damaging to the argument.”

“Explanations exist; they have existed for all time; there is always a well-known solution to every human problem—neat, p...”