Iain M. Banks, "The Hydrogen Sonata"

QiRia: Well, one thing that does happen when you live a long time is that you start to realise the essential futility of so much that we do, especially when you see the same patterns of behaviour repeated by succeeding generations and across different species. You see the same dreams, the same hopes, the same ambitions and aspirations, reiterated, and the same actions, the same courses and tactics and strategies, regurgitated, to the same predictable and often lamentable effects, and you start to think, “So? Does it really matter? Why really are you bothering with all this? Are these not just further doomed, asinine ways of attempting to fill your vacuous, pointless existence, wedged slivered as it is between the boundless infinitudes of dark oblivion book-ending its utter triviality?”
Cossont: Uh-huh. Is this a rhetorical question?
QiRia: It is a mistaken question. Meaning is everywhere. There is always meaning. Or at least all things show a disturbing tendency to have meaning ascribed to them when intelligent creatures are present. It's just that there's no final Meaning, with a capital M. Though the illusion that there might be is comforting for a certain class of mind.
Cossont: The poor, deluded, fools.
QiRia: I suspect, from your phrasing and your tone of voice, that, as a little earlier, you think you are being sarcastic. Well, no matter. However, there is another reaction to the never-ending plethora of unoriginal idiocies that life throws up with such erratic reliability, besides horror and despair.
Cossont: What's that?
QiRia: A kind of glee. Once one survives the trough that comes with the understanding that people are going to go on being stupid and cruel to each other no matter what, probably for ever—if one survives; many people choose suicide at this point instead—then one starts to take the attitude, “Oh well, never mind. It would be far preferable if things were better, but they're not, so let's make the most of it. Let's see what fresh fuckwittery the dolts can contrive to torment themselves with this time.”
Cossont: Not necessarily the most compassionate response.
QiRia: Indeed not. But my point is that it might be the only one that lets you cope with great age without becoming a devout hermit, and therefore represents a kind of filter favouring misanthropy. Nice people who are beginning to live to a great age—as it were—react with such revulsion to the burgeoning horrors that confront them, they generally prefer suicide. It's only us slightly malevolent types who are able to survive that realisation and find a kind of pleasure—or at least satisfaction—in watching how the latest generation or most recently evolved species can re-discover and beat out afresh the paths to disaster, ignominy and shame we had naively assumed might have become hopelessly over-grown.