“Jesus Christ, High Priest of the New and Eternal Covenant, taking human nature, introduced into this earthly exile that hymn which is sung throughout all ages in the halls of heaven. He attaches to himself the entire community of mankind and has them join him in singing his divine song of praise.
For he continues his priestly work through his Church. The Church, by celebrating the Eucharist and by other means, especially the celebration of the divine office, is ceaselessly engaged in praising the Lord and interceding for the salvation of the entire world...” - Sacrosanctum Concilium, 83-85.