"To me there has never been a higher source of earthly honor or distinction than that connected with advances in science."

"This most beautiful system of the sun, planets and comets, could only proceed from the counsel and dominion of an intelligent and powerful Being."

"Gravity must be caused by some agent acting constantly according to certain laws; but whether this agent be material or immaterial, I have left to the consideration of my readers."

"Atheism is so senseless and odious to mankind that it never had many professors."

"The particles of light are exceedingly small, and move with exceeding swiftness."