I abjure with a sincere heart and unfeigned faith, I curse and detest the said errors and heresies, and generally all and every error and sect contrary to the Holy Catholic Church.

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.

Scripture is a book about going to Heaven. It's not a book about how the heavens go.

And who can doubt that it will lead to the worst disorders when minds created free by God are compelled to submit slavishly to an outside will? When we are told to deny our senses and subject them to the whim of others? When people devoid of whatsoever competence are made judges over experts and are granted authority to treat them as they please? These are the novelties which are apt to bring about the ruin of commonwealths and the subversion of the state.

To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.

Nature is written in mathematical language.

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