The most precious thing in the world is not "cannot get" or "lost", but the happiness that can be grasped now. But happiness has been slowly flowing away from my fingers like fine sand. It's not that I don't want to, but that I can't keep it. Even though I worked so hard!
Since I can't grasp happiness, let it return to my 'can't get' and your 'lost'. Or maybe, this is real happiness!