"Fearing no insult, asking for no crown, receive with indifference both flattery and slander, and do not argue with a fool."

"Light-minded society mercilessly persecutes in reality what it allows in theory."

"Oh, how many discoveries does the spirit of enlightenment prepare for us!"

"I am a great admirer of the future, and I believe it is full of hope."

"What is truth? A question that has tormented mankind for centuries."