The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

If you think you understand quantum mechanics, you don't understand quantum mechanics.

Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

If you can't explain something to a first year student, then you haven't really understood .

God was invented to explain mystery. God is always invented to explain those things that you do not understand.

Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.

My rule is, when you are unhappy, think about it. But when you're happy, don't. Why spoil it? You're probably happy for some ridiculous reason and you'd just spoil it to know it.

Religion is a culture of faith; science is a culture of doubt.

The only way to deep happiness is to do something you love to the best of your ability

Einstein was a giant. His head was in the clouds, but his feet were on the ground. But those of us who are not that tall have to choose!

We cannot ignore our gift of the future.

Had (President) Kennedy turned to his advisers and wailed, "What can we beat the Russians at?" and if someone had cried "Backgammon!" at that point, Apollo would never have happened.

Nothing is predestined: The obstacles of your past can become the gateways that lead to new beginnings.

No theory is good unless it permits, not rest, but the greatest work. No theory is good except on condition that one use it to go on beyond.

Certes, they been lye to hounds, for an hound when he cometh by the roses, or by other bushes, though he may nat pisse, yet wole he heve up his leg and make a countenance to pisse.

Good writing is good writing no matter what genre you're writing in, and I believe that there are only a handful of fundamental craft tools that are essential for any genre-including nonfiction.

A girl's just as hot as the shoes she choose

We can give our smiles, our encouragement, our sympathy to someone who needs them every day of the year.

Life is terrible. It rules us, we do not rule it.

It is not man the ecological crisis threatens to destroy but the quality of human life.