"There is a world of creatures, living beings, animals, entelechies, souls, in the least part of matter."

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

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

"The monads are inextinguishable and indestructible."

"Men act like brutes in so far as the sequences of their perceptions are determined only by the principle of memory."