"To be is to be a value."

"Nothing is accomplished all at once, and it is one of my great maxims, and one of the most completely verified, that Nature makes no leaps: a maxim which I have called the law of continuity."

"Nature has established patterns originating in the return of events, but only for the most part. New illnesses flood the human race, so that no matter how many experiments you have done on corpses, yo…"

"The true method of advancing the sciences is to first lay solid foundations."

"I also take it for granted that every created thing, and consequently the created monad also, is subject to change, and indeed that this change is continual in each one."