Galileo Galilei

Who would set a limit to the mind of man? Who would dare assert that we know all there is to be known?

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

I give infinite thanks to God, who has been pleased to make me the first observer of admirable things unrevealed to bygone ages.

To deny the principles of philosophy is to reject reason itself.

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.

It is not in the power of any created being to make things true or false, but only to make us think them so.

Eppur si muove! (And yet it moves!)

Aristotle was indeed a great man, and his writings are excellent; but he was a man, and not a god.

The deeper I go into the sciences, the more I am convinced that the world is the work of an all-wise Creator.

The book of nature is written in the language of mathematics.

I hold the sun to be situated motionless in the center of the revolution of the celestial orbs while the earth revolves around the sun.

It is a beautiful and admirable thing to search out the causes of natural phenomena.

With the telescope, I have discovered many things that contradict the ideas of ancient philosophers.

Facts which at first seem improbable will, even on scant explanation, drop the cloak which has hidden them and stand forth in naked and simple beauty.

I do not believe that the same God who has given us senses, reason and intellect would have us abandon their use.

What is important is to understand the language of nature, not to impose on it our own prejudices.

I wish to persuade the wise and not to compel them.

The senses, being the interpreters of natural effects, are the only door to scientific knowledge.

It is a great pity that there are so few who are interested in the true causes of things.

I have loved the stars too fondly to be fearful of the night.