"The custom of believing what others believe, and of doing what others do, is the most powerful obstacle to the discovery of truth."

"I am a thing that thinks, that doubts, that affirms, that denies, that wills, that refuses, that imagines also, and that perceives."

"The reading of all good books is like a conversation with the finest minds of past centuries."

"I suppose therefore that all the things I see are false; I believe that none of those things ever existed which my fallacious memory represents to me; I consider that I possess no senses; I imagine th…"

"I would not advise anyone to read my books who has not the leisure and inclination to meditate seriously with me."