If you can't explain something to a first year student, then you haven't really understood .
I would rather have questions that can't be answered than answers that can't be questioned.
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.
Science is the belief in the ignorance of experts.
The first principle is that you must not fool yourself and you are the easiest person to fool.
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.
Religion is a culture of faith; science is a culture of doubt.
Don't pay attention to "authorities," think for yourself.
We never are definitely right, we can only be sure we are wrong.
Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.
You can always recognize truth by its beauty and simplicity.
If you think you understand quantum mechanics, you don't understand quantum mechanics.
We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."
You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing -- that's what counts.
Looking back at the worst times, it always seems that they were times in which there were people who believed with absolute faith and absolute dogmatism in something. And they were so serious in this matter that they insisted that the rest of the world agree with them. And then they would do things that were directly inconsistent with their own beliefs in order to maintain that what they said was true.
I'm smart enough to know that I'm dumb.
I, a universe of atoms, an atom in the universe.
If you thought that science was certain - well, that is just an error on your part.
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.
First you guess. Don't laugh, this is the most important step. Then you compute the consequences. Compare the consequences to experience. If it disagrees with experience, the guess is wrong. In that simple statement is the key to science. It doesn't matter how beautiful your guess is or how smart you are or what your name is. If it disagrees with experience, it's wrong. That's all there is to it.
We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty.
Outside of their particular area of expertise scientists are just as dumb as the next person.
Teach principles not formulas.
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.
To develop working ideas efficiently, I try to fail as fast as I can.
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