"Advent is a time of waiting, conversion and of hope: waiting-memory of the first, humble coming of the Lord in our mortal flesh; waiting-supplication for his final, glorious coming as Lord of history and universal judge; conversion, to which the liturgy at this time often refers, quoting the prophets . . . joyful hope that the salvation already accomplished by Christ . . . and the reality of grace in the world, will mature and reach their fullness, thereby granting us what is promised by faith."