Almighty and everlasting God, the Brightness of faithful souls, who didst bring the Gentiles to Thy light, and made known unto them Him who is the true Light, and the bright and morning Star, fill, we beseech Thee, the world with Thy glory, and show Thyself by the radiance of Thy light unto all nations; through Jesus Christ our Lord. Amen.

—Gregorian Sacramentary