Unfortunately, in the case of Iraq, I believe we could have done that through an inspection process. I was calling for a few months more to complete our work. We hadn’t seen indications of weapons of mass destruction. We hadn’t seen indications of nuclear weapons. ... Unfortunately, it didn’t work that way. There was faulty intelligence. There were lots of other considerations that made a decision to go to war tempting, to get rid of Saddam Hussein.

No, no. Well, you know, biology is such a complex system. It’s totally different from the engineering. We cannot design. Many people tried to find the therapy for cancer, but all failed. And myself, I never expected my research, working on the immune system, would lead to the cancer therapy. But, in a sense, I’m very fortunate that I also thought about it. You know, you have to try many things and if you’re lucky you can hit, but you have to pursue. That’s my feeling.

Yes. Having lived through an era, where I was thinking of going to graduate school and was strongly discouraged because I would never be able to do anything but teach in a city college … Ah ha ha, life has changed!

It is not the critic who counts; not the man who points out how the strong man stumbles or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, and comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows the great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who know neither victory nor defeat.

Many people talk about a willingness to have failures. I hate failures. I don't think you should strike to make failures. I think it's OK to make mistakes – but by the time they become real failures, you probably should have discovered them much earlier.