"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."

"He who hasn't tasted bitter things hasn't earned sweet things."

"Everything that is possible demands to exist."

"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…"

"I do not conceive of any reality at all as without genuine unity."