On the festival of Epiphany you heard that it was so called on account of the manifestation of Christ, which occurred that the new-born Babe might not be unknown, but revealed; for if we had not heard of His birth, it would have been of no avail. Hence it is that during these days we preach also upon other Gospel lessons which refer to the manifestation of Christ. Thus we use the one relating to Christ’s Baptism in the Jordan by John, and also the one which speaks of His first miracle, performed at the marriage at Cana, where He manifested Himself as Lord over all. These manifestations took place not only that Jesus should be known among men, but also that He might be acknowledged and praised as One who is more than human, born to have dominion over everything; and also that we should recognize Him as our Savior, upon whom we can depend in every distress and anxiety, and from whom we can obtain our help.
(Luther’s House Postil, Sermon for the 1st Sunday after Epiphany, Volume 1, p. 169)