"There are two labyrinths of the human mind: one concerns the composition of the continuum, and the other the nature of freedom, and both spring from the same source—the infinite."

"The passing condition which involves and represents a multiplicity in the unity, or in the simple substance, is nothing else than what is called perception. This should be carefully distinguished from…"

"The monads are the true atoms of nature, and, in a word, the elements of things."

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

"The world is not a machine. Everything in it is force, life, thought."