I'm always so excited about what I do that I try to get everyone to feel that way.
In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.
I would rather have questions that can't be answered than answers that can't be questioned.
Fall in love with some activity, and do it! Nobody ever figures out what life is all about, and it doesn't matter. Explore the world. Nearly everything is really interesting if you go into it deeply enough. Work as hard and as much as you want to on the things you like to do the best. Don't think about what you want to be, but what you want to do. Keep up some kind of a minimum with other things so that society doesn't stop you from doing anything at all.
Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.
You have no responsibility to live up to what other people think you ought to accomplish. I have no responsibility to be like they expect me to be. It's their mistake, not my failing.
When a scientist doesn't know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty - some most unsure, some nearly sure, but none absolutely certain.
Our vanity is hardest to wound precisely when our pride has just been wounded.
Things are never as bad or as good as they seem.
Time, like a preacher in the days of the Puritans, turned the hour-glass on his high pulpit, the church belfry.
I've spent my life trying to be better than I was, and I am a brother to all who share the same aspiration.