What I like about [Berthold] Brecht, it's very interesting. When Helene Weigel came over and somebody talked about Lotte Lenya and said "well, she wasn't alienating." And Weigel said "No, no, no. Why, Lotte Lenya was so true - who cares?" She said: "Berti only developed the theory of alienation in order to stop bad acting." I heard her say that. Now that's brilliant.

If I hadn't been a part of [Harry Potter] I would have been deeply upset.

People are not what they seem to be according to their looks.

Snowpiercer has both [optimistic and pessimistic]. It was essentially optimistic. The most pessimistic was my part, because of his knowledge. He knows how it started. The status quo, he knows, has to be maintained, otherwise there is no chance. He knows that this revolution is completely understandable and is also commendable. He also knows the negatives. In the end, that's not a very positive position to be in.

I left drama school and went straight into a 10-week film for which I was paid £75 I might say, which for 1962 was one heck of a lot of money.

The common misconception is that we create films for ourselves. And I really don't do it for myself. I get stopped in the street by people saying, "Do you mind if I say this about your work?" Do I mind? I'm delighted. I do it for you. It's not for me. It's my living, yes, sure.

A mathematician either has a feeling for equations and an understanding and delight in it, not only in the purity of it, but in its beauty as well. I don't think that's something that you learn at school. I think you can get better in mathematics on a school level, but when you're talking about being a mathematician, I think that's definitely a gift of genes or whatever, you know? Whatever your pool is.