"The mind is not only capable of knowing [innate ideas], but further of finding them in itself; and if it had only the simple capacity to receive knowledge…it would not be the source of necessary truth…"

"Every distinct perception implies infinity."

"I have said more than once that I would give all my books to have the fame of having discovered a single useful truth for the good of mankind."

"I do not believe that a world without evil, preferable in order to ours, is possible; otherwise it would have been preferred. It is necessary to believe that the mixture of evil has produced the great…"

"Nothing is without a reason."