We never are definitely right, we can only be sure we are wrong.

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!

Travel is the best teacher. The only way to an open mind is by taking a plane out into the open world.

Beware of being only a writer.

If human help fails, God will never forsake thee.

in principle and reality, libraries are life-enhancing palaces of wonder

Woe to him who would ascribe something like reason to Chance and make a religion of surrendering to it.

I understand China, and I understand the Chinese mind. I understand where they're coming from. They are not our friend.

We are all more than the sum of our sins.

Make today your master piece.

Drunkenness is simply voluntary insanity.

There has never been a protracted war from which a country has benefitted.