O Lord, our heavenly father, Almighty and everlasting God, who hast safely brought us to the beginning of this day, defend us in the same with Thy mighty power; and grant that this day we fall into no sin, neither run into any kind of danger; but that all our doings, being ordered by Thy governance, may be righteous in Thy sight; through Jesus Christ our Lord—Amen.

Gelasian Sacramentary, A.D. 494.

O Lord, who hast mercy upon all, take away from me my sins, and mercifully kindle in me the fire of Thy Holy Spirit. Take away from me the heart of stone, and give me a heart of flesh, a heart to love and adore Thee, a heart to delight in Thee, to follow and to enjoy Thee, for Christ’s sake—Amen.

St. Ambrose (340–397).