Most merciful God, who hast so loved the world as to give thine only begotten Son, that whosoever believeth in him should not perish but have everlasting life: Vouchsafe unto us, we humbly pray thee, the precious gift of faith, whereby we may know that the Son of God is come; and, being rooted and grounded in the mystery of the Word made flesh, may have power to overcome the world, and gain the blessed immortality of heaven; through the merits of the same incarnate Christ, who liveth and reigneth with thee in the unity of the Holy Spirit, ever one God, world without end.
–Book of Common Order
Thank you for posting this prayer on Christmas day.