Gottfried Wilhelm Leibniz — "The soul is a living mirror of the universe."

"Nothing is necessitated whose opposite is possible."

"I maintain that the monads, which are the true atoms of nature, have no windows through which anything could enter or depart."

"The nature of the monad is representative; consequently, nothing can limit it to represent only a part of things."

"The monads are inextinguishable and indestructible."

"All the different classes of beings which taken together make up the universe are, in the ideas of God who knows distinctly their essential gradations, only so many ordinates of a single curve so clos…"