The early Christians developed the ‘church’s year’ as a way of telling, learning and reliving the story of Jesus, which stands at the heart of our faith. As they did so, they came to understand that it wasn’t simply a matter of going round and round the same sequence and never getting anywhere. Think of a bicycle wheel; it goes round and round, but it is moving forwards, not standing still. The same circuit around the hub of the wheel becomes part of the forward movement of the bicycle as a whole. So it is with the church’s year. We go round the circuit: Advent, Christmas, Epiphany, Lent, Holy Week and Good Friday, Easter, Pentecost. The traditional Western churches sum all this up on Trinity Sunday, as we learn more deeply who our glorious God really is. But the point of it all is that, in doing this, we are not simply going round and round the same topics and never getting anywhere. We are signing on as part of God’s larger project, God’s forward purposes, his plans for the whole creation to be renewed, so that (as the prophets said) the earth will be full of the knowledge and glory of the Lord, as the waters cover the sea.
Wright, N.T.. Advent for Everyone: A Journey with the Apostles . Presbyterian Publishing. Kindle Edition.