Galileo Galilei Quotes

All truths are easy to understand once they are discovered; the point is to discover them.

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

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

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

In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.

Knowing thyself, that is the greatest wisdom.

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

Two truths cannot contradict one another.

To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.

To understand the Universe, you must understand the language in which it's written, the language of Mathematics.

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.

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

There are those who reason well, but they are greatly outnumbered by those who reason badly.

Nonetheless, it moves.

The greatest wisdom is to get to know oneself.

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

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

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

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.

Where the senses fail us, reason must step in.

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

And who can doubt that it will lead to the worst disorders when minds created free by God are compelled to submit slavishly to an outside will? When we are told to deny our senses and subject them to the whim of others? When people devoid of whatsoever competence are made judges over experts and are granted authority to treat them as they please? These are the novelties which are apt to bring about the ruin of commonwealths and the subversion of the state.

In the long run my observations have convinced me that some men, reasoning preposterously, first establish some conclusion in their minds which, either because of its being their own or because of their having received it from some person who has their entire confidence, impresses them so deeply that one finds it impossible ever to get it out of their heads.

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

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