“To establish that a rule is likely to be true, one must try to prove it false.”

“The willingness to change one’s mind in the light of new evidence is a sign of rationality not weakness.”

“You have killed my love. You used to stir my imagination. Now you don't even stir my curiosity. You simply produce no effect. I loved you because you were marvelous, because you had genius and inte...”

“Intelligence minus purpose equals stupidity.”

“But spontaneity is not by any means a blind, disorderly urge, a mere power of caprice. A philosophy restricted to the alternatives of conventional language has no way of conceiving an intelligence ...”

“I think that when you are famous every weakness is exaggerated.”

“My strength and my weakness are twins in the same womb.”

“Only strength can cooperate. Weakness can only beg.”