I'm going to play with physics, whenever I want to, without worrying about any importance whatsoever.

Why make yourself miserable saying things like, "Why do we have such bad luck? What has God done to us? What have we done to deserve this?" - all of which, if you understand reality and take it completely into your heart, are irrelevant and unsolvable. They are just things that nobody can know. Your situation is just an accident of life.

Teach principles not formulas.

Fall in love with some activity, and do it! Nobody ever figures out what life is all about, and it doesn't matter.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

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.

Scientific knowledge is an enabling power to do either good or bad — but it does not carry instructions on how to use it.