I, Galileo, son of the late Vicenzo Galilei, swear that I never said that the prime numbers are useless. What I said was that you cannot count lunar craters by counting 2, 3, 5, 7.

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

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

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

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.

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.

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

Knowing thyself, that is the greatest wisdom.

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

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

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

Poor people! They build tunnels to reach the light.

I wish to cry. Yet, I laugh, and my lipstick leaves a red stain like a bloody crescent moon on the top of the beer can.

Don't hoo, hoo, hoo me. There's a fine line between hoo, hoo, hoo and hiel, hiel, hiel.

Forget about whether global warming exists. My focus is on jobs.

When I'm at an event, I like to be an eccentric dresser. I will just keep wearing what I like.

My time in the Army gave me an understanding for what it takes to provide for our national security and what it means to our service members and their families.

My God! How terrible these money questions are for an artist!

I wanted to think about ways to get an American readership concerned with what is happening in Mexico, but also to reframe it as a problem Americans share.

When tyranny becomes law, rebellion is a right.

Nothing has to be true forever. Just for long enough, to tell you the truth.