Don't screw it up. Don't take it for granted. Try new things, even if you're old. Do the right thing, because if you do the right thing, the money will follow. Decide what you stand for. Finally, don't worry about being cool—be warm.

By the way, the guys with very high grades are not necessarily the people that are the most successful in later life. They may be the ones that can regurgitate gracefully, and they get very high grades. But if the guys that have to work for it and do not have such good grades can do something extra, and prove that they can perform, they may have a chance.

You have to be intelligent, and be able to cope with stress. It is a stressful life, both mentally and physically. Those are the qualities to succeed as a surgeon.

Everything that’s happened to me was because I said yes to everything and gave it a go. I never thought, wouldn’t it be good if I got two Michelin stars and my own TV shows. I just tried my hardest at everything I got the chance to do. If I could give the younger me advice I’d just say, never underestimate graft. Give up on sleep, work very hard, and it will pay off. Graft graft graft. And never give up.

Then there was Von Neumann, the great mathemati-cian. We used to go for walks on Sunday. We'd walk in the canyons, and we'd often walk with Bethe, and Von Neumann, and Bacher. It was a great pleasure. And Von Neumann gave me an interesting idea; that you don't have to be responsible for the world that you're in.

For example, I was a little surprised when I was talking to a friend who was going to go on the radio. He does work on cosmology and astronomy, and he wondered how he would explain what the applications of this work were. "Well," I said, "there aren't any." He said, "Yes, but then we won't get support for more research of this kind." I think that's kind of dishonest. If you're representing yourself as a scientist, then you should explain to the layman what you're doing—and if they don't want to support you under those circumstances, then that's their decision.

the colonel said I shouldn't tell them how the neutrons work and all the details because we want to keep things separate, so just tell them what to do to keep it safe.

Then I had another thought: Physics disgusts me a little bit now, but I used to enjoy doing physics.  Why did I enjoy it?  I used to play with it.  I used to do whatever I felt like doing—it didn’t have to do with whether it was important for the development of nuclear physics, but whether it was interesting and amusing for me to play with.

It is necessary, I believe, to accept this idea, not only for science, but also for other things; it is of great value to acknowledge ignorance.  It is a fact that when we make decisions in our life we don't necessarily know that we are making them correctly; we only think that we are doing the best we can – and that is what we should do.

So I got this new attitude.  Now that I am burned out and I’ll never accomplish anything, I’ve got this nice position at the university teaching classes which I rather enjoy, and just like I read the Arabian Nights for pleasure, I’m going to play with physics, whenever I want to, without worrying about any importance whatsoever.