"The instruction we have received, the example we have seen, the books we have read, the conversations we have had, all these make us what we are."

"What is tolerance? It is the prerogative of humanity. We are all full of weakness and errors; let us reciprocally pardon each other's follies—it is the first law of nature."

"The more we are enlightened, the more we are free."

"It is dangerous to be right in matters on which the established authorities are wrong."

"The more I read, the more I acquire, the more certain I am that I know nothing."