"I do not like X as a symbol for multiplication, as it is easily confounded with x."

"The universe is an immense ocean of monads."

"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."

"Nihil est sine ratione. There is nothing without a reason."

"There are never in nature two beings, which are precisely alike, and in which it is not possible to find some difference which is internal, or based on some intrinsic quality."