Vision, I say, is related to light itself. But of this sensation and the things pertaining to it, I pretend to understand but little; and since even a long time would not suffice to explain that trifle, or even to hint at an explanation, I pass over this in silence.

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

Measure what is measurable, and make measurable what is not so.

But of all other stupendous inventions, what sublimity of mind must have been his who conceived how to communicate his most secret thoughts to any other person, though very far distant either in time or place? And with no greater difficulty than the various arrangement of two dozen little signs upon paper? Let this be the seal of all the admirable inventions of man.

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

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

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