A good part of the fame of most celebrated men is due to the shortsightedness of their admirers

When a book and a head collide and a hollow sound is heard, must it always have come from the book?

Everyone is perfectly willing to learn from unpleasant experience - if only the damage of the first lesson could be repaired.

Man is a masterpiece of creation if for no other reason than that, all the weight of evidence for determinism notwithstanding, he believes he has free will.

All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.

Brevity: To say at once whatever is to be said.

What is called an acute knowledge of human nature is mostly nothing but the observer's own weaknesses reflected back from others.