"The ultimate reason of things must lie in a necessary substance, in which the detail of changes exists only eminently, as in its source; and this is what we call God."

"Each simple substance or Monad is a mirror of the universe according to its point of view."

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

"A great doctor kills more people than a great general."

"Nature makes no leaps."