"The properties of bodies depend upon the figure, size, and motion of their constituent particles."

"I have often observed that the most unexpected results are the most instructive."

"I have always looked upon the study of philosophy as a means to a more excellent end, which is the knowledge of God."

"I have made it my business to examine, not to believe."

"I have always been of the opinion, that the best way to avoid errors, is to be diffident of our own judgments."