"If I have done the public any service, it is due to my patient thought."

"The power of gravity is of such a nature as to penetrate to the very centres of the sun and planets, without suffering the least diminution of its force."

"The changing of bodies into light, and light into bodies, is very conformable to the course of Nature."

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

"God is the same God, always and everywhere. He is omnipresent not virtually only, but also substantially; for virtue cannot subsist without substance."