Galileo Galilei

I have seen the phases of Venus, which proves that it revolves around the sun.

The truth will always prevail, no matter how much it is suppressed.

I have been persecuted for my beliefs, but I will not recant what I know to be true.

I have observed that the Milky Way is composed of innumerable stars.

I have discovered that the earth is not the center of the universe.

The more I learn, the more I realize how much I don't know.

Nevertheless, it moves.

The senses, however, though they may be deceived, are not to be distrusted.

I think that in the discussion of natural problems we ought not to begin at the authority of places of Scripture, but at sensible experiments and necessary demonstrations.

To make a man a philosopher, you must first make him a man.

The great book of nature can be read only by those who know the language in which it was written. And that language is mathematics.

It is not in the power of any created being to make a truth.

I have never met a man so ignorant that I could not learn something from him.

The universe is a grand book which cannot be understood unless one first learns to comprehend the language and interpret the characters in which it is written. It is written in the language of mathematics, and its characters are triangles, circles, and other geometrical figures, without which it is humanly impossible to understand a single word of it; without these, one is wandering about in a dark labyrinth.

The deeper we penetrate into the universe, the more we realize that it is not a collection of isolated objects, but a living whole, in which every part is connected to every other part.

And who can doubt that it will be a matter of great satisfaction to find the causes of phenomena which are continually before our eyes, but of which the reasons are unknown?

I consider the most important thing to be the discovery of truth, and not the victory of an argument.

It is a beautiful and admirable thing to be able to demonstrate that which is true.

The senses, assisted by reason, are the only true guides to knowledge.

Nature is written in mathematical characters.