You do not know anything until you have practiced.

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!

It is only a mere fallacy to say you are quitting when your heartbeat is in tune with the beat. A real change is a real change!

Lift your spirits by practicing random acts of kindness.

It requires strength of character in order to think and to act in opposite fashion from the crowd and also patience to wait for opportunities that may be spaced years apart.

I love that sense of release as you throw yourself into the crowd as hundreds of arms are carrying you.

Leaves die, but trees do not. They only undress.

Words are plentiful; deeds are precious.

The past goes right on pulling me apart, though I can scarcely remember the people or the issues.

No one leaves a long-term relationship scot-free or without conflict.

She's really gone, then. The little girl with the back of her shirt sticking out like a duck tail.

Love is not a promissory note.