Speak softly and carry a big stick; you will go far.

The only man who never makes mistakes is the man who never does anything.

It is not the critic who counts; not the man who points out how the strong man stumbles. The credit belongs to the man who is actually in the arena.

My mother gave birth to twins: myself and fear.

-- Thomas Hobbes

Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

-- Bertrand Russell

I paint myself because I am so often alone and because I am the subject I know best.

-- Frida Kahlo

I always felt that a scientist owes the world only one thing, and that is the truth as he sees it. If the truth contradicts deeply held beliefs, that is too bad. Tact and diplomacy are fine in international relations, in politics, perhaps even in business; in science only one thing matters, and that is the facts.

-- Hans Eysenck

I came to Russia knowing absolutely nothing.

-- Catherine II of Russia

I would rather call Weber the father of experimental psychology.

-- Wilhelm Wundt