"The most beautiful order of the planets and comets could not have arisen without the design and dominion of an intelligent and powerful Being."

"Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it."

"A man may imagine things that are false, but he can only understand things that are true, for if the things be false, the apprehension of them is not understanding."

"The causes of gravity are not yet discovered. It is by experiments and observations that we are to know them."

"He who thinks half-heartedly will not believe in God; but he who thinks seriously will believe in God, and will not doubt that God is the author of the world."