The Church in her Liturgy takes us in spirit back to the time before the incarnation of the Son of God, as though it were really yet to take place.
Cardinal Wiseman says: We are not dryly exhorted to profit by that blessed event, but we are daily made to sigh with the Fathers of old, "Send down the dew, ye heavens, from above, and let the clouds rain the Just One: let the earth be opened, and bud forth the Redeemer." The Collects on three of the four Sundays of that season begin with the words, "Lord, raise up thy power and come" -- as though we feared our iniquities would prevent His being born.
Flowers and relics of Saints are not to be placed on the altars during the Office and Masses of this time, except on the third Sunday ; and the same prohibition and exception exist in regard to the use of the organ.
The popular idea that the four weeks of Advent symbolize the four thousand years of darkness in which the world was enveloped before the coming of Christ finds no confirmation in the Liturgy.
During this time the faithful are admonished To attain this object the Church has arranged the Liturgy for this season.