splendor lucis aeternae, et sol justitiae:
veni, et illumina sedentes in tenebris, et umbra mortis.
O Morning Star,
splendour of light eternal and sun of righteousness:
Come and enlighten those who dwell in darkness and the shadow of death.
"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
The Benedictine monks had a purpose in the way they ordered the "O Antiphons." The first letter of the Latin title of each one when taken backwards (Emmanuel, Rex, Oriens, Clavis, Radix, Adonai, Sapientia) form a Latin acrostic of "Ero Cras" which translates to "Tomorrow, I will come."