"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 …"

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

"I am about to take leave of this earth, and I can say that I have seen more wonders than any man before me."

"To deny one's senses and reason is to deny God's gifts."

"I do not think it is necessary to believe that the same God who gave us our senses, our reason, and our intellect, also intended us to forego their use."