"Man is a credulous animal, and must believe something; in the absence of good grounds for belief, he will be satisfied with bad ones."

"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts."

"Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines."

"I would never die for my beliefs because I might be wrong."

"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."

"Many people would sooner die than think; In fact, they do so."

"By all means, let's not confuse ourselves with the facts!"

"If you never did, you should. These things are fun and fun is good!"

"A man's dying is more the survivors' affair than his own."

"In waking a tiger, use a long stick."

"Some circumstantial evidence is very strong, as when you find a trout in the milk."

"Any war that requires the suspension of reason as a necessity for support is a bad war."