The Divine Office & the Mass: Inseparable

Even if the Liturgical Office could be separated from the Mass, we should still be able to say that it unites those who take part in it to the intentions of Christ and His Church; but the two cannot be separated. The Divine Office is the prelude and preparation as well as the setting and sequence of the Eucharistic Mysteries. Archeologists have traced the many relationships between the Divine Office and the Mass. For example, the office of Matins presents a striking analogy with the night or morning service held in the primitive Church as a preparation for the Mysteriesi a reminiscence of which is still to be found in the early part of Holy Mass as we know it.

The Psalms of the Nocturns correspond to the Introit and Gradual; while in the Lessons from the Old Testament or from the Epistles, in the second nocturn giving the legends of the Saints, in the Homily on the Gospel, there are relics of the Prophecies, the Apostolic Messages to the Churches, the Acts of the Martyrs and the parts of the Gospel, which were read in those early celebrations. Then, the Catechumens were dismissed, and this Missa was followed by the Holy Sacrifice. According to some scholars, the Te Deum may be nothing else but an ancient kind of IZZatio or Preface. This close dependence of the Breviary on the first part of Mass is at least a very plausible theory.

Thus, from its connection with the Divine Mysteries and because it is the official prayer of the Church, the Divine Office leads to union with the purposes of God and with the intentions of Christ and His Church.

Source: Liturgical Prayer by Clerissac