The Great O Antiphons
December 17 — O SAPIENTIA: O Wisdom, you came forth from the mouth of the Most High and, reaching from beginning to end, you ordered all things mightily and sweetly. Come, and teach us the way of prudence.
December 18 — O ADONAI: O Adonai and Ruler of the House of Israel, you appeared to Moses in the fire of the burning bush and on Mount Sinai gave him your law. Come, and with outstretched arm redeem us.
December 19 — O RADIX JESSE: O Root of Jesse, you stand as a sign for the peoples; before you kings shall keep silence and to you all nations shall have recourse. Come, save us, and do not delay.
December 20 — O CLAVIS DAVID: O Key of David and Scepter of the House of Israel; you open and no one closes; you close and no one opens. Come, and deliver from the chains of prison those who sit in darkness and in the shadow of death.
December 21 — O ORIENS: O Rising Dawn, Radiance of the Light eternal and Sun of Justice: come and enlighten those who sit in darkness and in the shadow of death.
December 22 — O REX GENTIUM: O King of the Gentiles and the Desired of all, you are the cornerstone that binds two into one. Come, and save humanity which you fashioned out of clay.
December 23 — O EMMANUEL: O Emmanuel, our King and Lawgiver, the Expected of the nations and their Savior. Come and save us, O Lord our God.
For more on the O Antiphons, see this post from last advent.