Nature isn't classical, dammit, and if you want to make a simulation of nature, you'd better make it quantum mechanical, and by golly it's a wonderful problem, because it doesn't look so easy.

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!

Don’t be victim of circumstances but be victorious.

Oh! lovely voices of the skyWhich hymned the Saviour's birth, Are ye not singing still on high, Ye that sang, "Peace on earth"?

America is so vast that almost everything said about it is likely to be true and the opposite is probably equally true.

The difficulty is not so great to die for a friend, as to find a friend worth dying for.

I learned a long time ago that trying to micromanage the perfect vacation is always a disaster. That leads to terrible times.

God walks with us. He scoops us up in His arms or simply sits with us in silent strength until we cannot avoid the awesome recognition that yes, even now, He is there.

Illness is the doctor to whom we pay most heed; to kindness, to knowledge, we make promise only; pain we obey.

You could argue the banks are much better capitalised than they were going into the crisis, and everyone's in a much more vigilant state because they still remember the crisis.

It's the age-old thing - it's such a cliche - but why worry about things you have no control over?

Do not believe hastily.