All human wisdom works and has worries and grief as reward.

Our reason arises, at the very least, from this twofold lesson of sensuous revelations and human testimonies.

Self knowledge begins with the neighbor, the mirror, and just the same with true self-love; that goes from the mirror to the matter.

Few authors understand themselves, and a proper reader must not only understand his author but also be able to see beyond him.

Hence it happens that one takes words for concepts, and concepts for the things themselves

I look upon logical proofs the way a well-bred girl looks upon a love letter

Nature is a book, a letter, a fairy tale (in the philosophical sense) or whatever you want to call it.