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

"To apply oneself to a search for the truth, without any intent to serve some predetermined end, is the true path to discovery."

"I have written up many reasons and refutations on the subject, but I have not dared until now to bring them into the open, being warned by the fortunes of Copernicus himself, our master, who procured …"

"I do not hope for any relief, and that is because I have committed no crime."

"Aristotle was indeed a great man, and his writings are excellent; but he was a man, and not a god."

"The senses, being the interpreters of natural effects, are the only door to scientific knowledge."