O Rex gentium, et desideratus earum, lapisque angularis, qui facis utraque unum: veni, et salva hominem, quem de limo formasti.
O King of the gentiles and their desired One, the cornerstone that makes both one: come, and deliver man, whom Thou didst form out of the dust of the earth.
His empire shall be multiplied, and there shall be no end of peace: he shall sit upon the throne of David, and upon his kingdom; to establish it and strengthen it with judgment and with justice, from henceforth and for ever: the zeal of the Lord of hosts will perform this.
And he shall judge the Gentiles, and rebuke many people: and they shall turn their swords into ploughshares, and their spears into sickles: nation shall not lift up sword against nation, neither shall they be exercised any more to war.
Check out my publication which provides commentary on the O Antiphons, in addition to direction on how to pray the Mass during Advent. This publication is a perennial addition to your library. Go HERE for more information on Praying the Mass During Advent.