I notice that if you have the door to your office closed, you get more work done today and tomorrow, and you are more productive than most. But 10 years later somehow you don't know quite know what problems are worth working on; all the hard work you do is sort of tangential in importance. He who works with the door open gets all kinds of interruptions, but he also occasionally gets clues as to what the world is and what might be important.

That’s a very good question. I think I’m a very lazy writer and by that I mean that I do not battle, I don’t struggle too hard against it. If I have difficulties in the writing, I just go and do other things. I don’t feel a compulsion to write. Of course, when I start writing then it becomes a compulsive activity, because I’ve begun something and I want to continue, want to finish it. … I know there are other writers who sit down religiously every morning, they take their espresso, they put a clean sheet of paper there and they sit looking at that paper until they’ve finished or covered at least a number of those pages. No, I’m not like that. I have to be ready. It has to gestate it for quite a while and then it’s ready to burst forth.

There were times when I thought I wanted to be a cartoonist. If I weren’t a film director, I think cartoons would have been a good alternative. But I never properly studied drawing, so my drawings are strange. But when I’m prepping films, it’s good preparation — and comforting to me — to do the storyboards. It’s fun, too, like drawing a whole comic.

Charlie and I decided long ago that in an investment lifetime it's just too hard to make hundreds of smart decisions. That judgment became ever more compelling as Berkshire's capital mushroomed and the universe of investments that could significantly affect our results shrank dramatically. Therefore, we adopted a strategy that required our being smart - and not too smart at that - only a very few times. Indeed, we'll now settle for one good idea a year. (Charlie says it's my turn.)

Being a father teaches you very quickly that you are not the center of your own universe. That’s one of the gifts of having to wipe poop!

“David, you are going to walk among kings.” This was my mum’s prophecy when I was small. My father is from a royal family in Nigeria, so I interpreted it that way. Remarkably, she was right: I went on to play King Pelasgus, Henry VI, Martin Luther King and Seretse Khama.

Right now. I am a very blessed man.

God has never let me down. He’s a key factor in guiding my decisions and feeling safe within them. My wife and I suffered three miscarriages, one of them quite late in the pregnancy. Without faith, we would have retreated into our own corners to lick our wounds, but our love increased.