"It is the weight, not numbers of experiments that is to be regarded."

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

"Nature is pleased with simplicity. And nature is no dummy."

"What is it that induces a man to be a philosopher? It is not the love of truth, but the love of fame, or the love of novelty, or the love of power."

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