It means being conscious and aware enough to choose what you pay attention to and to choose how you construct meaning from experience.
David Foster WallaceThe lives of most people are small tight pallid and sad, more to be mourned than their deaths. We starve at the banquet: We cannot see that there is a banquet because seeing the banquet requires that we see also ourselves sitting there starving-seeing ourselves clearly, even for a moment, is shattering. We are not dead but asleep, dreaming of ourselves.
David Foster WallaceDr. Ambrose himself told Mark Nechtr...that the problem with young people, starting sometime in about the 1960s, is that they tend to live too intensely inside their own social moment, and thus tend to see all existence past age thirty or so as somehow postcoital. It's then that they'll relax, settle back, sad animals, to watch- and learn, as Ambrose himself said he learned from hard artistic and academic experience- that life instead of being rated a hard R, or even a soft R, actually rarely even makes it into distribution. Tends to be too slow.
David Foster WallaceI felt, as I became a later and later bloomer, alienated not just from my own recalcitrant glabrous little body but in a way from the whole elemental exterior I'd come to see as my co-conspirator.
David Foster Wallace