"I think that if I'm still here in ten thousand years, I'm going to be crazy as hell. Ten thousand years, pal! Ten thousand years ago, the state-of-the-art was a goat. You really think you're going to be anything recognizably human in a hundred centuries? Me, I'm not interested in being a post-person. I'm going to wake up one day, and I'm going to say, 'Well, I guess I've seen about enough,' and that'll be my last day."

I had seen where he was going with this, and I had stopped paying attention while I readied my response. I probably should have paid more attention. "But why? Why not just deadhead for a few centuries, see if there's anything that takes your fancy, and if not, back to sleep for a few more? Why do anything so final ?"

He embarrassed me by making a show of thinking it over again, making me feel like I was just a half-pissed glib poltroon. "I suppose it's because nothing else is. I've always known that someday, I was going to stop moving, stop seeking, stop kicking, and have done with it. There'll come a day when I don't have anything left to do, except stop."

Down and out in the magic kingdom
Cory Doctorow