The Final Week of Waiting
For most of Advent, the Church waits patiently — preparing, repenting, longing. But in the final seven days before Christmas, the waiting intensifies. The liturgy shifts. The readings become more urgent. And at Evening Prayer (Vespers), the Church sings a series of antiphons — short liturgical hymns — that are among the oldest, most beautiful, and most theologically rich texts in the entire liturgical year.
These are the O Antiphons — so called because each one begins with the exclamation “O,” followed by a title of Christ drawn from the Old Testament. They are sung or recited from 17 to 23 December, one per day, building in intensity until Christmas Eve.
Most Catholics know them without knowing it — because the beloved Advent hymn “O Come, O Come, Emmanuel” is a poetic translation of the O Antiphons. Each verse of the hymn corresponds to one of the seven antiphons. When you sing that hymn, you are singing a prayer that has been on the lips of Christians for over a thousand years.
The Seven Antiphons
17 December: O Sapientia (O Wisdom)
O Wisdom, coming forth from the mouth of the Most High, reaching from one end to the other, mightily and sweetly ordering all things: come and teach us the way of prudence.
The first antiphon addresses Christ as Wisdom — the divine Wisdom described in the Book of Proverbs and the Book of Wisdom, present with God before creation, ordering all things with beauty and purpose. The cry is for wisdom in a world that has lost its way.
18 December: O Adonai (O Lord)
O Lord and Ruler of the house of Israel, who appeared to Moses in the fire of the burning bush and gave him the law on Sinai: come and redeem us with outstretched arm.
Christ is addressed as Adonai — the Lord who revealed Himself to Moses, who led Israel through the desert, who gave the Law on Sinai. The cry is for redemption — for God to act with the same power He showed in the Exodus.
19 December: O Radix Jesse (O Root of Jesse)
O Root of Jesse, standing as a sign among the peoples; before you kings will shut their mouths, to you the nations will make their prayer: come and deliver us, and delay no more.
Christ is the Root of Jesse — the descendant of King David’s father, the fulfilment of the prophecy that a shoot would spring from the stump of Jesse (Isaiah 11:1). The cry is for deliverance — and the urgency mounts: “delay no more.”
20 December: O Clavis David (O Key of David)
O Key of David and Sceptre of the house of Israel; you open and no one can shut; you shut and no one can open: come and lead the prisoners from the prison house, those who dwell in darkness and the shadow of death.
Christ is the Key of David — the one who holds the key to the kingdom, who opens the doors of heaven and the gates of the prison. The image is drawn from Isaiah 22:22 — the same passage that underlies the giving of the keys to Peter (Matthew 16:19). The cry is for liberation — for those trapped in darkness to be brought into the light.
21 December: O Oriens (O Dayspring)
O Dayspring, splendour of light eternal and sun of righteousness: come and enlighten those who dwell in darkness and the shadow of death.
Christ is the Dayspring — the dawn, the rising sun, the light that breaks into the world’s darkness. The image draws on Malachi 4:2 (“the sun of righteousness shall rise with healing in its wings”) and Luke 1:78 (Zechariah’s prophecy of the “dayspring from on high”). The cry is for light — in the darkest days of the year, the Church begs for the Sun that never sets.
22 December: O Rex Gentium (O King of the Nations)
O King of the nations and their desire, the cornerstone making both one: come and save the human race, which you fashioned from clay.
Christ is the King of all peoples — not one nation’s god but the Lord of all. He is the cornerstone (Ephesians 2:20) that unites what was divided — Jew and Gentile, heaven and earth. The cry is universal: save the human race. All of it.
23 December: O Emmanuel (O God with Us)
O Emmanuel, our king and lawgiver, the desire of all nations and their salvation: come and save us, O Lord our God.
The final antiphon is the climax. Emmanuel — “God with us.” The name given to the child in Isaiah’s prophecy (Isaiah 7:14), the name that encompasses everything Advent has been waiting for. God is not sending a messenger. He is coming Himself. Come. Save us. Be with us.
Tomorrow is Christmas Eve. The waiting is almost over.
The Hidden Acrostic
The O Antiphons contain a detail so subtle that it may have been an accident — or it may have been a stroke of medieval genius.
If you take the first letter of each antiphon’s Latin title in reverse order — Emmanuel, Rex, Oriens, Clavis, Radix, Adonai, Sapientia — you get: E-R-O-C-R-A-S, which is Latin for ero cras — “I will come tomorrow.”
Read in order, the antiphons are the Church crying out to Christ: come! Read in reverse, they are Christ’s answer: I will come tomorrow.
Whether this acrostic was intentional or a happy coincidence, it captures the dialogue of Advent perfectly — the Church’s longing and God’s promise, woven together in seven prayers across seven days.
How to Pray Them
The O Antiphons are part of the Liturgy of the Hours — specifically, they are the Magnificat antiphons at Vespers on the seven days before Christmas. If you pray Evening Prayer from the breviary or a liturgical app, you will encounter them automatically.
If you do not pray the Hours, you can still incorporate them into your Advent prayer. Here are some ways:
Pray one each evening. From 17 to 23 December, read the antiphon for the day slowly and reflectively. Sit with the title of Christ it uses. What does it mean to call Him Wisdom? Lord? Root of Jesse? Key of David? Let the title deepen your understanding of who is coming.
Sing “O Come, O Come, Emmanuel.” The hymn is a metrical translation of the antiphons. Sing one verse per day — matching the verse to the day’s antiphon. By Christmas Eve, you will have sung the whole hymn, and you will understand it in a way you never did before.
Use them as a family devotion. Light the Advent wreath and read the antiphon of the day together. For children, the titles are an opportunity to explore different aspects of who Jesus is — not just the baby in the manger but the Wisdom of God, the Key of David, the King of Nations.
Why They Matter
The O Antiphons matter because they do what all great liturgy does: they take the deepest truths of the faith and put them on your lips. They are not explanations. They are cries — the cries of a world that knows it is in darkness and knows that light is coming.
They are also a reminder that Advent is not just about Christmas. It is about longing — the longing that began with Adam and Eve, that sustained the prophets through centuries of waiting, and that continues in every human heart that senses something is missing and does not know its name.
The O Antiphons give that longing a voice. And on Christmas morning, when the waiting ends and the Word becomes flesh, you will know — in a way that no amount of shopping and decorating can produce — what it means to receive what you have been longing for.
O come, O come, Emmanuel.