I maintain that the frustration is an important, almost crucial, ingredient. I think that the best painting involves frustration. The point about the late Rembrandt [paintings] is not that it's satisfying but on the contrary that it is disturbing and frustrating. Because really, what he [Rembrandt] has done is to eliminate any plane - anything between that image and you. The Van Dyck [portrait] hasn't. It says [only] I'm a painting. The Rembrandt says: I am not a painting, I am a real man. But he is not a real man either. What is it then, that you are looking at?

Actually, one of the real problems that always bothers me [in creating a painting] is sustaining a feeling. I mean, when I look at Poussin now, well, I think that's the most incredible thing to maintain the feeling for a year, however long it took Poussin, I'm telling you, to paint this vast structure. Bur perhaps that is not given to us now. I don't know... .Actually all all modern art puzzles me. I don't understand it. II really don't. I don't know whether it is fragmentary [as David Sylvester the interviewer suggested]. I have a sickening nostalgia for this other state of sustaining a feeling for months, being able to construct and build a picture. Well Mondrian, I think, did that, of course. He was almost one of the last artists to do that. I wish I could get there.

There are so many things to paint in the world – in the cities – so much to see. Does art need to represent this variety and contribute to its proliferation? Can art be that free? The difficulties begin when you understand what it is that the soul will not permit the hand to make. To paint is always to start at the beginning again, yet being unable to avoid the familiar arguments about what you see yourself painting. The canvas you are working on modifies the previous ones in an unending, baffling chain which never seems to finish. (What sympathy is demanded of the viewer! He is asked to 'see' the future links).

All these troubles revolve around the irritable mutual dependence of life and art – with their need and contempt for one another. Of necessity, to create is a temporary state and cannot be possessed, because you learn and relearn that it is the lie and mask of Art and, too, its mortification, which promise a continuity. There are twenty crucial minutes in the evolution of each of my paintings. The closer I get to that time - those twenty minutes – the more intensely subjective I become – bit the more objective, too. Your eye gets sharper, you become continuously more and more critical. There is no measure I can hold on..