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

What for others is style, for me is soul.

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

Being, belief and reason are pure relations, which cannot be dealt with absolutely, and are not things but pure scholastic concepts, signs for understanding, not for worshipping, aids to awaken our attention, not to fetter it.

When I rest my feet my mind also ceases to function.

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

If only I was as eloquent as Demosthenes, I would have to do no more than repeat a single word three times.