Here is the Collect for Wednesday of the 3rd Week of Advent.
Praesta, quaesumus, omnipotens Deus,
ut Filii tui ventura sollemnitas
et praesentis nobis vitae remedia largiatur,
et praemia aeterna concedat.
This prayer was in Rotulus 6 published with the Veronese Sacramentary.
Almighty God, grant, we beseech You,
that the upcoming solemn feast of Your Son,
both may lavish upon aids healing us of this present life,
and concede to us eternal rewards.