"All truths are easy to understand once they are discovered; the point is to discover them."

"I have never met a man so ignorant that I couldn't learn something from him."

"The deeper I go into the sciences, the more I am convinced that the world is the work of an all-wise Creator."

"Truly, if there were no other way to demonstrate the motion of the Earth, the tides alone would suffice."

"It is surely harmful to souls to make it a heresy to believe what has been proved."