Here is the Collect for Thursday of the 2nd Week of Advent
Excita, Domine, corda nostra
ad praeparandas Unigeniti tui vias,
ut, per eius adventum,
purificatis tibi mentibus servire mereamur.
This was in the 1962 Missale for the 2nd Sunday of Advent. Centuries before, the "Tridentine" Missal it was in the Gelasian Sacramentary, as well as the Gregorian.
Stir up our hearts, O Lord,
to make ready the paths for Your Only-Begotten,
so that through His Coming
we may be worthy to serve Your with minds made pure.