There is this one life we are given. This we know. All the rest of it—the heavens, the reincarnations, the other life-as-rehearsal scenarios—let us set those aside for the moment and concentrate on the indisputable facts staring at us: We are born, we live, we die. And most often, even if we are fortunate enough to ripen through the full flesh of our cycle on this earth, we will say it has passed too quickly, as unto a dream. The grains. Through the hourglass. Jack Kerouac has been pushing his response to these essential facts since he wrote his cultural…