It's hard to visualize James Bond without seeing one of the actors who played him. And it's hard to visualize Harry Potter without seeing Daniel Radcliffe. A movie is so visually powerful, so overwhelming, that it tends to crowd out how you might have imagined things.

What works in a story is very different than what works in cinema. For example, dialogue in books: If you translate it too faithfully, it sounds a little stilted, because we often don't speak the way we speak in novels. Oral language is much punchier, shorter sentences.

I turned around, stepped over the Zebra and threw myself overboard.

Scientists are a friendly, atheistic, hard-working, beer-drinking lot whose minds are preoccupied with sex, chess and baseball when they are not preoccupied with science.

I know what you want. You want a story that won't surprise you. That will confirm what you already know. That won't make you see higher or further or differently. You want a flat story. An immobile story. You want dry, yeastless factuality.

To my mind, faith is like being in the sun. When you are in the sun, can you avoid creating a shadow? Can you shake that area of darkness that clings to you, always shaped like you, as if constantly to remind you of yourself? You can’t. This shadow is doubt. And it goes wherever you go as long as you stay in the sun. And who wouldn’t want to be in the sun?

I have a fierce will to live. Others fight a little, then lose hope. Still others - and I am one of those - never give up. We fight and fight and fight. We fight no matter the cost of battle, the losses we take, the improbability of success. We fight to the very end.