“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...”

“Looking at small advantages prevents great affairs from being accomplished.”

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

“Stupidity lies in wanting to draw conclusions.”

“Almost anything carried to its logical extreme becomes depressing if not carcinogenic.”

“Theory-the seeing of patterns, showing the forest as well as the trees”

“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.”

“What matters is not the facts but how you discover and think about them.”