"The description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn."

"God in the beginning formed matter in solid, massy, hard, impenetrable, moveable particles, of such sizes and figures, and with such other properties, and in such proportion to space, as most conduced…"

"What goes up must come down."

"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."

"I built my first telescope with my own hands."