In the ideal world, all writers would have a Catholic childhood, or belong to some other religion which does the equivalent for you. Because Catholicism tells you at a very early age the world is not what you see; that beyond everything you see, and the appearance – or the accidents as they’re known – there is another reality, and it is a far more important reality. So it’s like running in the imagination. I think that this was the whole point for me – that from my earliest years I believed the world to have an overt face and a hidden face, and behind every cause another cause, and behind every explanation another explanation, which is perhaps of quite a different order. And if you cease to believe in Catholic doctrine it doesn’t mean that you lose that; you still regard the world as ineffable and mysterious and as something which perhaps in the end can’t quite be added up. It could be summed up as saying “all is not as it seems”, and of course that’s the first thing Catholicism tells you. And then it just runs through everything you write and everything you touch, really. Plus, it’s good to have something to rebel against.