Quotes from Galileo Galilei

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

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

Nothing can be taught to a man, only it's possibly to help him to discover it inside.

You cannot teach a person something he does not already know, you can only bring what he does know to his awareness.

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

Nothing occurs contrary to nature except the impossible, and that never occurs.

God is known by nature in his works, and by doctrine in his revealed word.

If you could see the earth illuminated when you were in a place as dark as night, it would look to you more splendid than the moon.

The laws of Nature are written in the language of mathematics...the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word.

Nature . . . is inexorable and immutable; she never transgresses the laws imposed upon her, nor cares a whit whether her abstruse reasons and methods of operations are understandable to men.

One can understand nature only when one has learned the language and the signs in which it speaks to us; but this language is mathematics and these signs are methematical figures.

Philosophy itself cannot but benefit from our disputes, for if our conceptions prove true, new achievements will be made; if false, their refutation will further confirm the original doctrines.

He who looks the higher is the more highly distinguished, and turning over the great book of nature (which is the proper object of philosophy) is the way to elevate one's gaze.

We cannot teach people anything we can only help them discover it within themselves.

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

The Bible shows the way to go to heaven, not the way the heavens go.

To command their professors of astronomy to refute their own observations is to command them not to see what they do see and not to understand what they do understand.

You can't teach anybody anything, only make them realize the answers are already inside them.

Measure what can be measured, and make measurable what cannot be measured.

Mathematics is the language with which God has written the universe.

Where the senses fail us, reason must step in.

Mathematics is the key and door to the sciences.

Science proceeds more by what it has learned to ignore than what it takes into account.

By denying scientific principles, one may maintain any paradox.