There was a time in my life when I was going in and out of houses that were extraordinarily different - from a working-class terrace in Northampton to the homes of friends who were really very wealthy. It was quite an odd position to be in, I realise looking back, and quite a nice one.

Lots of things are mysteries. But that doesn't mean there isn't an answer to them. It's just that scientists haven't found the answer yet.

People think that alien spaceships would be solid and made of metal and have lights all over them and move slowly through the sky because that is how we would build a spaceship if we were able to build one that big. But aliens, if they exist, would probably be very different from us. They might look like big slugs, or be flat like reflections. Or they might be bigger than planets. Or they might not have bodies at all. They might just be information, like in a computer. And their spaceships might look like clouds, or be made up of unconnected objects like dust or leaves.

You love someone, you've got to let something go.

One person looks around and sees a universe created by a god who watches over its long unfurling, marking the fall of sparrows and listening to the prayers of his finest creation. Another person believes that life, in all its baroque complexity, is a chemical aberration that will briefly decorate the surface of a ball of rock spinning somewhere among a billion galaxies. And the two of them could talk for hours and find no great difference between one another, for neither set of beliefs make us kinder or wiser.

The word "metaphor" means carrying something from one place to another . . . and it is when you describe something by using a word for something that it isn't. This means that the word "metaphor" is a metaphor. I think it should be called a lie because a pig is not like a day and people people do not have skeletons in their cupboards. And when I try and make a picture of the phrase in my head it just confuses me because imagining and apple in someone's eye doesn't have anything to do with liking someone a lot and it makes you forget what the person was talking about.

Most of my work consisted of crossing out. Crossing out was the secret of all good writing.