The earth, in fair and grateful exchange, pays back to the moon an illumination similar to that which it receives from her throughout nearly all the darkest gloom of the night.

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'.

...suffering and freedom have their limits...those limits are very near together.

The total ugliness and indifference of the worst features of the human race come out in their driving habits.

I soon realized that no journey carries one far unless, as it extends into the world around us, it goes an equal distance into the world within.

Health is the greatest possession. Contentment is the greatest treasure. Confidence is the greatest friend.

Knowing one day, I will be gone, makes me live fuller life.

There is no life after life. Whoever says there is, ignore him! The untruth must be ignored! Stick to the life and the science!

The Republicans have bought into the idea that people hate them because they're opposed to everything.

'Infidel' is a term of reproach, which Christians and Mohammedans, in their modesty, agree to apply to those who differ from them.

Do you know why the nose of the bull dog is sloped backwards? So it can keep on breathing without ever letting go.