"Superstition sets the whole world in flames; philosophy extinguishes them."

"The very idea of a God is a chimera, a chimera which makes us tremble."

"The greatest comfort of man in this life is the knowledge that he has done his duty."

"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."

"Beware of the books. It is not the book that is dangerous, but the spirit of the people who read it."