Pfiefer went on to explain why the O Antiphons end on Dec. 23.

“Traditionally feasts were said to begin on the eve of their celebration, so Christmas begins at sundown on Dec. 24,” he wrote.

The message in the antiphons holds true today, Pfeifer emphasized.

“Each Christmas Jesus fulfills the promise ‘I will come tomorrow’ by being born again as a tiny baby, the Godman, Jesus Christ,” he wrote. “We can make the following O Antiphons part of our Advent preparation for the birth of Christ by using them in our prayers or Advent scriptural readings.”

He added: “Then in gratitude and joy we celebrate the birth of our long-awaited savior, Jesus Christ — Christmas.”

The seven prayers accompany the Magnificat canticle, or the canticle of Mary, explains the United States Conference of Catholic Bishops (USCCB) on their webiste. The USCCB lists the text of the O Antiphons, each one asking the Messiah to come and, together, spelling out his response in the acrostic.

The verses of the Advent hymn O Come O Come Emmanuel also use titles taken from the O Antiphon prayers.

Related: Advent reconciliation and Christmas Mass times in Diocese of Saskatoon (LINK)

Related: Saskatoon Filipino Catholic community celebrates Simbang Gabi pre-Christmas Novena of Masses Dec. 15-24 (LINK)