I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.

The laws of nature are written by the hand of God in the language of mathematics.

And believe me, if I were again beginning my studies, I should follow the advice of Plato and start with the mathematical sciences, which proceed very cautiously and admit nothing as established until it has been rigorously demonstrated.

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

I do not think it is necessary to believe that the same God who has given us our senses, reason, and intelligence wished us to abandon their use, giving us by some other means the information that we could gain through them.

I am certainly interested in a tribunal in which, for having used my reason, I was deemed little less than a heretic. Who knows but men will reduce me from the profession of a philosopher to that of historian of the Inquisition!

The Milky Way is nothing else but a mass of innumerable stars planted together in clusters.