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

"The parts of all homogeneal hard bodies which fully touch one another, stick together with a very strong attraction."

"I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier sh…"

"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…"

"I was like a boy playing on the seashore."