THE metaphysical question is, therefore, how can we keep from singing? If human life is such that it is impossible to keep from singing -- or put less optimistically -- if human life is such that it is possible to sing when all around is crumbling, it is because the fact of our existence, in order to be recognised as existence at all, requires there to be something already there, already behind us, already above us, ready to be re-thought at all. To re-cognise our existence, to re-think it, is more than to say, I think therefore I am. It is to come to the fresh awareness that to be alive is to be a part of something comprehensive. Something not only more enduring than our lives, but something fundamentally worth dealing with in our lives.