They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.

Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.

It is very pious to say and prudent to affirm that the holy Bible can never speak untruth -- whenever its true meaning is understood. But I believe nobody will deny that it is often very abstruse, and may say things which are quite different from wha.

Mathematics is the key and door to the sciences.

Nature is written in mathematical language.

Alas! Your dear friend and servant Galileo has been for the last month hopelessly blind; so that this heaven, this earth, this universe, which I by my marvelous discoveries and clear demonstrations had enlarged a hundred thousand times beyond the belief of the wise men of bygone ages, henceforward for me is shrunk into such a small space as is filled by my own bodily sensations.

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