Today the Church celebrates the Solemnity of the Epiphany. “The Lord and ruler is coming; kingship is his, and government and power.” With these words the Church proclaims that today’s feast brings to a perfect fulfillment all the purposes of Advent. Epiphany, therefore, marks the liturgical zenith of the Advent-Christmas season. — Pius Parsch
The feast of the Epiphany, which was kept in the East and in certain Western Churches before being observed in Rome, seems to have been originally a feast of the nativity; January 6, for those churches where it was kept, was the equivalent of Christmas (December 25) in the Roman Church. The feast was introduced at Rome in the second half of the sixth century and became the complement and, so to say, the crown of the Christmas festival.
Epiphany means manifestation. What the Church celebrates today is the manifestation of our Lord to the whole world; after being made known to the shepherds of Bethlehem He is revealed to the Magi who have come from the East to adore Him. Christian tradition has ever seen in the Magi the first fruits of the Gentiles; they lead in their wake all the peoples of the earth, and thus the Epiphany is an affirmation of universal salvation.