"I am in earnest; I will not equivocate; I will not excuse; I will not retreat a single inch; and I will be heard."

"With reasonable men I will reason; with humane men I will plea; but to tyrants I will give no quarter, nor waste arguments where they will certainly be lost."

"On going to war over religion: You're basically killing each other to prove who's got the better imaginary friend."

"If you follow all the rules, you miss all the fun."

"It is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain."

"We need not to be let alone. We need to be really bothered once in a while. How long is it since you were really bothered? About something important, about something real?"

"Every author, however modest, keeps a most outrageous vanity chained like a madman in the padded cell of his breast."

"Dignity does not consist in possessing honors, but in deserving them."