From the Treasury of Daily Prayer:

The feast of the Epiphany of Our Lord commemorates no event but presents an idea that assumes concrete form only through the facts of our Lord’s life. The idea of Epiphany is that the Christ who was born in Bethlehem is recognized by the world as God. At Christmas, God appears as man, and at Epiphany, this man appears before the world as God. That Christ became man needed no proof. But that this man, this helpless child, is God needed proof. The manifestations of the Trinity, the signs and wonders performed by this man, and all His miracles have the purpose of proving to men that Jesus is God. Lately, especially in the Western Church, the story of the Magi has been associated with this feast day. As Gentiles who were brought to faith in Jesus Christ, the Magi represent all believers from the Gentile world.