Galileo Galilei

Ignorance is the mother of devotion.

To understand the universe, you must understand the language in which it's written. And that language is mathematics.

The senses, being the interpreters of natural effects, are the only true guides to natural philosophy.

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

It is a beautiful and admirable thing to observe how the human mind, by its own ingenuity, has been able to discover and demonstrate such profound truths.

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

I do not feel obliged to believe that the same God who has endowed us with senses, reason, and intellect has intended us to forgo their use and by some other means to give us knowledge which we can attain by them.

The greater the number of authorities, the more difficult it is to discover the truth.

I have discovered in the heavens many things that have not been seen before and that will be of great interest to all lovers of wisdom.

The universe is an immense, perpetual, and most perfect machine, which never stops working.

It is not in the power of any human being to make a thing true or false, but only to discover what is true or false.

I am about to publish a work on the motion of the earth, which will, I hope, be of some use to the world.

I consider the discovery of the satellites of Jupiter to be one of the most important discoveries ever made.

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

I have found that the moon is not a smooth, polished sphere, but is full of inequalities, mountains, and valleys.

The earth is a planet, and it moves around the sun, just like the other planets.

I cannot believe that God, who has given us senses, reason, and intellect, would intend us to abandon their use.

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.

I am content with the knowledge that I have gained, and I hope that it will be of benefit to future generations.

The purpose of science is to discover the truth, not to confirm preconceived notions.