"I do not believe that the same God who has given us senses, reason and intellect would have us abandon their use."

"I wish to persuade the wise and not to compel them."

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

"It is not in the power of any created being to make things true or false, but only to make us think them so."

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