Christmas Eve (Christmas I)

O God,
you have made this holy night
shine with the brightness
of the true Light.
Grant that we
who have known the mysteries of that Light
here on earth
may come to the fullness
of his joys in heaven;
who lives and reigns with you and the Holy Spirit,
one God, now and forever.

Source: Historic Collect for Christmas Eve (Christmas I), Gelasian, 8th Century

Source of this version: Newly translated for A Collection of Prayers

Original in Latin:

Deus, qui hanc sacratissimam noctem veri luminis fecisti illustratione clarescere, da, quaesumus, ut, cuius in terra mysteria lucis agnovimus, eius quoque gaudiis perfruamur in caelo. Qui tecum…

Bosco Peters gives the original with various translations in this article.