All theoretical chemistry is really physics; and all theoretical chemists know it.

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!

Dating is all about the chase. It's fun!

Calling it off comes easy enough if you haven't told the girl you are smitten with her.

Each Australian is a Ulysses.

But if we're going to make our immigration system work, then we have to be prepared to talk honestly and without fear about these important and very sensitive issues.

This is the pure form of servitude: to exist as an instrument.

I don't know whether I prefer Astroturf to grass. I never smoked Astroturf.

Hear from those who have gone before you.

Only he who is without anything is without enemies.

Older people sit down and ask, 'What is it?' but the boy asks, 'What can I do with it?'.

I was raised on Westerns. They were part of what going into the movies was.