The idea that this is all there is .... nothing more .... probably less .... but this is definitely IT.
IT being whatever it is.
We create endless quests for elusive Holy Grails just to give us something to do with our lives. Or at least some kind of meaning to our lives. But of course we know that they are illusions. Self-designed myths and fantasies to keep us going during what is essentially a very light state of being.