The seasons of Christmas and Epiphany have a catechetical and a spiritual link. In a sense we can say that the Christmas season addresses the mystery of God having become man. Where the season of the Epiphany moves the Christmas season to it's next spiritual step, and that is man is to become like Christ.
This link shows a theological progression that has long been taught by the Church. For example, St. Athanasius, (293 to 373 A.D.) wrote thatThe Son of God became man so as to deify us in Himself'.Another way of expressing this has been that God became man so the man could become like God. Pretty strong words.
But we find St.Paul speaking on the same terms. In Ephesians 2:4-10 he writes
But God, who is rich in mercy, because of the great love he had for us, even when we were dead in our transgressions, brought us to life with Christ (by grace you have been saved), raised us up with him, and seated us with him in the heavens in Christ Jesus, that in the ages to come he might show the immeasurable riches of his grace in his kindness to us in Christ Jesus. For by grace you have been saved through faith, and this is not from you; it is the gift of God; it is not from works, so no one may boast. For we are his handiwork, created in Christ Jesus for the good works that God has prepared in advance, that we should live in them.When we tag this passage above to Ephesians 1:9-10
For God has made known to us in all wisdom and insight the mystery of his will, according to his purpose which he set forth in Christ as a plan for the fulness of time, to unite all things in him, things in heaven and things on earth.we can see that God is actually drawing all of creation through out the course of history into the process of deification, which is to return everything to its original state, as it was before the fall.
This is expressed in the prayers in our Prayer Book such as the liturgy of the Great Vigil of Easter. We pray
How holy is this night, when wickedness is put to flight, and sin is washed away. It restores innocence to the fallen, and joy to those who mourn. It casts out pride and hatred, and brings peace and concord.But could this explain why God has called each of us to be Christians? Becoming Christian means entering into this great movement of God. A movement that allows us to find purpose and completeness in Jesus Christ. Amen
How blessed is this night, when earth and heaven are joined and man is reconciled to God.