"There is a certain destiny of everything, regulated by the foreknowledge and providence of God, who has established an infallible connection between the antecedent and the consequent."

"It is a bad thing to be a heretic, but it is worse to be a schismatic."

"I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is actual in nature."

"There is nothing without a reason."

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