I would like to have been concerned about this existential threat sooner.

I was fortunate even from that point of view because I got a very good research collaboration agreement with Upjohn, the American Upjohn company. So that could help me to go on with my research.

I've had some downturns in my career and various problems, but in fact all those kind of problems turned into something even better. It's kind of amazing, various times in my career.

Nothing in this world is worth having or worth doing unless it means effort, pain, difficulty. No kind of life is worth leading if it is always an easy life. I know that your life is hard; I know that your work is hard; and hardest of all for those of you who have the highest trained consciences, and who therefore always feel how much you ought to do. I know your work is hard, and that is why I congratulate you with all my heart. I have never in my life envied a human being who led an easy life; I have envied a great many people who led difficult lives and led them well.

Sometimes some of the things I’ve been working on for years and years, they’re just not getting any better or not going anywhere, so they fade away. And sometimes you start something, and within a few days, it develops enough that it feels complete. Each piece is different and develops itself in a different way. Some artists make the same thing for 50 years, and that doesn’t interest me. My current show at Lisson Gallery will be my 18 th with this gallery, I’ve been working with them since 1974, and all the shows have been different. You don’t repeat a show. So this solo show is comprised of pieces I’ve made in the last three years.