“The first step towards philosophy is incredulity.”

“Scepticism is the first step towards truth.”

“From fanaticism to barbarism is only one step.”

“Nous aimons, sans nous en douter, tout ce qui nous livre à nos penchants, nous séduit et excuse notre faiblesse.”

“A nation which thinks that it is belief in God and not good law which makes people honest does not seem to me very advanced.”

“There is no moral precept that does not have something inconvenient about it.”

“The fact is that she was terribly undressed and I was extremely undressed too. The fact is that I still had my hand where she didn't have anything and she had hers where the same wasn't quite true of me. The fact is that I found myself underneath her and consequently she found herself on top of me.”