the real depth human spirit is defined by "being, or doing, just for the sake of it, just because". we are the children of infinity, and we will always be restless - that's just our nature, for innately we are of infinity, the giga drill that has pierced all heavens. you know it yourself, have a man born in a mansion with all pleasures available and after some years he will want to escape merely just to see what's outside his mansion, just for the sake of knowing "what's more", even though all his animal desires are satisfied, there will always be some flicker of faint light that tells him "Move" and he will move, just for the sake of moving, of seeing and understanding and experiencing more, it's not even for voracious base desire either, but that's just what he -does-, for that's his innate nature, being a child of Infinity. put a wall around him, and he will want to break it, "just because" even if there's absolutely no 'reason', no good benefit out of it, but because that's simply what he really is, no real reason. and that's the real depth of human spirit, at the depth, not when merely the surface.