Today's O antiphon, O Oriens, is sung as part of the commemoration of the feria:
O Day-Spring, brightness of the everlasting Light, Sun of Righteousness; come, to give light to them that sit in darkness, and in the shadow of death!
The antiphon reflects the prophesy of Isaiah 9:2
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 9:2We should pray then, for the gift of knowledge to illuminate us and guide our leaders.