"For the best and safest way of philosophizing seems to be, first to inquire diligently into the properties of things, and of establishing them by experiment, and then to proceed more slowly to hypothe…"

"In the absence of any other proof, the thumb alone would convince me of God's existence."

"What is there in places almost empty of air (such as the space between the planets) to hinder the free motion of bodies?"

"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. When I look at the solar system, I see the earth at the right distance from the sun to receive the proper amounts of heat and light. This did not happen by chance."