The Last of the Advent "O" Antiphons - Day 7
O Emmanuel: “O Emmanuel, king and lawgiver, desire of the nations, Savior of all people, come and set us free, Lord our God.” Isaiah had prophesied, “The Lord himself will give you this sign: the Virgin shall be with child, and bear a son, and shall name him Emmanuel.”
(“Emmanuel” means “God is with us”)"the Benedictine monks arranged these antiphons with a definite purpose. If one starts with the last title and takes the first letter of each one - Emmanuel, Rex, Oriens, Clavis, Radix, Adonai, Sapientia - the Latin words ero cras are formed, meaning, “Tomorrow, I will come.” Therefore, the Lord Jesus, whose coming we have prepared for in Advent and whom we have addressed in these seven Messianic titles, now speaks to us, “Tomorrow, I will come.” So the “O Antiphons” not only bring intensity to our Advent preparation, but bring it to a joyful conclusion."
(From R. Greenberg, San Francisco Conservatory of Music)