Because we hope, even when there is no reason to hope. Because we are human. Here’s Israeli author and peace activist David Grossman:
About four years ago, when my second-oldest son, Uri, was to join the army, I could no longer follow my recent ways. A sense of urgency and alarm washed over me, leaving me restless. I then began writing a novel that treats directly the bleak reality in which I live. A novel that depicts how external violence and the cruelty of the general political and military reality penetrate the tender and vulnerable tissue of a single family, ultimately tearing it asunder.
“As soon as one writes,” Natalia Ginzburg says, “one miraculously ignores the current circumstances of one’s life, yet our happiness or misery leads us to write in a certain way. When we are happy, our imagination is more dominant. When miserable, the power of our memory takes over.”
It is hard to talk about yourself. I will only say what I can at this point, and from the location where I sit.
I write. In wake of the death of my son Uri last summer in the war between Israel and Lebanon, the awareness of what happened has sunk into every cell of mine. The power of memory is indeed enormous and heavy, and at times has a paralyzing quality to it. Nevertheless, the act of writing itself at this time creates for me a type of “space,” a mental territory that I’ve never experienced before, where death is not only the absolute and one-dimensional negation of life.
Writers know that when we write, we feel the world move; it is flexible, crammed with possibilities. It certainly isn’t frozen. Wherever human existence permeates, there is no freezing and no paralysis, and actually, there is no status quo. Even if we sometimes err to think that there is a status quo; even if some are very keen to have us believe that a status quo exists. When I write, even now, the world is not closing in on me, and it does not grow ever so narrow: it also makes gestures of opening up toward a future prospect.
Read the whole beautiful, anguished thing.

