The Fourth Sunday of Advent
ALMIGHTY God, give us grace that we may cast away the works of darkness, and put upon us the armour of light, now in the time of this mortal life, in which thy Son Jesus Christ came to visit us in great humility; that in the last day, when he shall come again in his glorious majesty to judge both the quick and the dead, we may rise to the life immortal, through him who liveth and reigneth with thee and the Holy Ghost, now and ever. Amen.
Source: Bishop Gelasius of Rome Sacramentary [464 AD]. The 1662 edition added the "running the race that is before us" "Succor" is to run to help, while "sore let" is to thwart, hinder
whose shoe's latchet I am not worthy to unloose