O God, who through the child-bearing of the holy Virgin hast graciously revealed the brightness of thy glory unto all the world: grant, we beseech thee; that we may worship with purity of faith the mystery of so wondrous an Incarnation, and always celebrate it with due reverence; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, ever one God, world without end. Amen.