Abraham responds "Here I am" when God asks him to sacrifice his son, and he answers "Here I am" when his son asks him about what is happening. It's a paradoxical moment. He can't be fully present for his God or his son.

From space, astronauts can see people making love as a tiny speck of light. Not light, exactly, but a glow that could be confused for light - a coital radiance that takes generations to pour like honey through the darkness to the astronaut's eyes. In about one and a half centuries - after the lovers who made the glow will have long since been laid permanently on their backs - the metropolitan cities will be seen from space. They will glow all year. Smaller cities will also be seen, but with great difficulty. Towns will be virtually impossible to spot. Individual couples invisible.

I first became a vegetarian when I was nine, in response to an argument made by a radical babysitter. My great change - which lasted a couple of weeks - was based on the very simple instinct that it's wrong to kill animals for food.

There are two kinds of sculptures. There's the kind that subtracts: Michelangelo starts with a block of marble and chips away. And then there is the kind that adds, building with clay, piling it on. The way I write novels is to keep piling on and piling on and piling on.

It's true, I am afraid of dying. I am afraid of the world moving forward without me, of my absence going unnoticed, or worse, being some natural force propelling life on. Is it selfish? Am I such a bad person for dreaming of a world that ends when I do? I don't mean the world ending with respect to me, but every set of eyes closing with mine.

What kind of world would we create if three times a day we activated our compassion and reason as we sat down to eat, if we had the moral imagination and the pragmatic will to change our most fundamental act of consumption?

This brings me back to the image of Kafka standing before a fish in the Berlin aquarium, a fish on which his gaze fell in a newly found peace after he decided not to eat animals. Kafka recognized that fish as a member of his invisible family- not as his equal, of course, but as another being that was his concern.