O Morning Star…

December 21

O Morning Star,
splendour of light eternal and sun of righteousness:
Come and enlighten those
who dwell in darkness and the shadow of death.

Source: The O Antiphons

Source of this version: https://en.wikipedia.org/wiki/O_Antiphons, also in Ancient Collects, ed. William Bright, p. 21

Latin:

O Oriens,
splendor lucis aeternae, et sol justitiae:
veni, et illumina sedentes in tenebris, et umbra mortis.

Isaiah had prophesied:

• “The people who walked in darkness have seen a great light; those who lived in a land of deep darkness—on them light has shined.” Isaiah 9:2

Also compare Isaiah 60:1-2 and Malachi 4:2