"I have found that most of the sects are right in a good part of what they assert, but not so much in what they deny."

"If geometry were as much opposed to our passions and present interests as is ethics, we should contest it and violate it but little less, notwithstanding all the demonstrations of Euclid and Archimede…"

"Monads have no windows through which anything could enter or depart."

"There are also two kinds of truths: those of reasoning and those of fact. Truths of reasoning are necessary and their opposite is impossible; truths of fact are contingent and their opposite is possib…"

"Every substance is a perpetual living mirror of the universe."