"The soul follows its own laws, and the body likewise follows its own laws; and they agree with each other in virtue of the pre-established harmony."

"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…"

"The happier the man, the less he needs to be amused; like a healthy man who does not need to be drugged."

"The actual world is the most beautiful possible."

"The actual world is the most perfect of all possible worlds."