The one sentence sermon is: An epiphany is a light bulb moment, when the penny drops and Yes, you can have one today!
Be that all as it may, 6 January is traditionally the day by which you should have all your Christmas decorations down because it marks the end of the "twelve days of Christmas." The Twelve Days of Christmas is a festive Christian season to celebrate the nativity of Jesus. In most Western Church traditions Christmas Day is the First Day of Christmas and the Twelve Days are 25 December to 5 January, but for others, the twelve days begin on 26 December and end on 6 January.
Twelfth Night or, What You Will is a comedy by William Shakespeare, written around 1601–02 as a Twelfth Night's entertainment for the close of the Christmas season.
Here is a prayer for this day: