Wisdom is one of the few things that looks bigger the further away it is.

That was always the dream, wasn't it? 'I wish I'd known then what I know now'? But when you got older you found out that you NOW wasn't YOU then. You then was a twerp. You then was what you had to be to start out on the rocky road of becoming you now, and one of the rocky patches on that road was being a twerp.

When you look into the abyss, it’s not supposed to wave back.

OH, THERE HAS TO BE SOMETHING IN THE STOCKING THAT MAKES A NOISE, said Death. OTHERWISE, WHAT IS 4:30 A.M. FOR?

Seeing, contrary to popular wisdom, isn't believing. It's where belief stops, because it isn't needed any more.

There would be a price... But if you were worried about the price, then why were you in the shop?

There's a lot of science in it, and as Slartibartfast [in The Hitchhiker's Guide to the Galaxy] said: 'I am a great fan of science, but I cannot do a quadratic equation.' I've never, ever been able to do one. I remember one occasion at Warwick University, when Jack and Ian were at their wits' end because I couldn't get it. I felt totally ashamed.