Scientists are explorers. Philosophers are tourists.

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!

One of the advantages of science is that one's work, ultimately, is either replicated or it is not.

you talk so much, I don't know when to pay attention

What are you accepting that would not be a part of your ideal day?

In the Republican party, crazy is a constituency.

I'm no longer thinking of Madrid. That dream is dead. The only thing I dream about now is Manchester United and winning the Champions League again in Rome.

There's never been a presidency that's done so much in such a short period of time, and we haven't even started the big work yet.

I was born trash in a land where the people all believe themselves natural aristocrats.

The person upon whom the schoolboys' attention centred was, of course, the Headmaster.

The nation which reposes on the pillow of political confidence, will sooner or later end its political existence in a deadly lethargy.

When you have a Senate that is 50 Democrats and 49 Republicans and one independent, it's quite obvious that the only way we are going to get something done is if we work together.