Lord, hear our prayers,
and lighten the darkness of our hearts
by your gracious appearing;
for you live and reign
with the Father and the Holy Spirit,
one God, now and forever.
Source: Historic Collect for the Third Sunday in Advent, Gregorian, 10th Century
Source of this version: Newly translated for A Collection of Prayers
Original in Latin:
Aurem tuam, quæsumus, Dómine, précibus nostris accómmoda: et mentis nostræ ténebras, grátia tuæ visitatiónis illústra; Qui vivis…
See this article by Bosco Peters.