187 Quotes by Galileo Galilei

(T)he increase of known truths stimulates the investigation, establishment, and growth of the arts.

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.

Philosophy is written in this all-encompassing book that is constantly open to our eyes, that is the universe; but it cannot be understood unless one first learns to understand the language and knows the characters in which it is written. It is written in mathematical language, and its characters are triangles, circles, and other geometrical figures; without these it is humanly impossible to understand a word of it, and one wanders in a dark labyrinth.

By denying scientific principles, one may maintain any paradox.

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

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

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

My dear Kepler, what would you say of the learned here, who, replete with the pertinacity of the asp, have steadfastly refused to cast a glance through the telescope? What shall we make of this? Shall we laugh, or shall we cry?