The Church, “expert in humanity” (as Pope Paul VI put it), knows that the mystery of Christmas (like that of Easter) is so great that it cannot be adequately plumbed – let alone celebrated – in a single day. And so, taking a page out of our Jewish liturgical heritage, the Church gives us an octave observance – eight full days to consider the central doctrine of the Incarnation, enabling us to reflect on it from a variety of perspectives, not unlike holding a diamond up to the sun in an attempt to appreciate its beauty from many different angles.