Once upon a time a medieval philosopher told a story about a bird flying from an unknown place of origin through a mead-hall to an unknown destination. The philosopher believed that religion was able to explain the significance of the flight of that bird; the dark from which it came, it’s time in the light of the mead-hall and the dark to which it was returning. The version of the story I heard held that the philosopher was a Christian, telling his story in a pagan mead-hall, and that he succeeded in converting his audience using the metaphor of the bird in flight for the meaning of our life on this earth. I have had my own experience of seeing that bird fly through the mead-hall in which I was sitting, but the religious and scientific philosophers seeking to illuminate the glorious flight of human existence were, to my mind, perched on another cusp of the evolution of knowledge. Religion and philosophy are the explicators of the fact that for humans there is the unknowable; they are