Some, merely to contradict what I had said, did not scruple to cast doubt upon things they had seen with their own eyes again and again.

It is a beautiful and delightful sight to behold the body of the Moon.

In regard to the philosophers, if they be true philosophers, i.e., lovers of truth, they should not be irritated that the earth moves. Rather, if they realize that they have held a false belief, they should thank those have shown them the truth; and if their opinion stands firm that the earth doesn't move, they will have reason to boast than be angered.

See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.

Holy Scripture could never lie or err...its decrees are of absolute and inviolable truth.

Mathematics is the key and door to the sciences.

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