Considering, then, the Breviary as a liturgical book, we find that the
Divine Office has four general divisions, corresponding to the divisions
of our Lord's life. First, from Advent to Septuagesima; second, from
Septuagesima to Easter; third, from Easter to Pentecost; fourth, from
Pentecost to Advent. These divisions correspond also to the divisions of
the year, winter, spring, summer and autumn.

The end and object of the Office are to invite us to join in the
infinite praise which the Son of God rendered to His Father during His
life, and which He renders still in Heaven and in the Tabernacle.
"_Domine in unione illius divinae intentionis qua ipse in terris laudes
Deo persolvisti, has tibi Horas persolvo,_" "O Lord, in union with that
divine intention wherewith Thou whilst here on earth Thyself didst
praise God, I offer these Hours to Thee." The life of Christ is divided
into four principal divisions: first, His birth, circumcision, epiphany,
presentation; second, His public life and His death; third, His
resurrection, ascension, and descent of the Holy Ghost; fourth, His
mystic life in the Church and in Heaven. Hence arise the four general
divisions of the Divine Office:--

_First General Division which begins the Church's year_. From Advent
to Septuagesima:--The birth of the Saviour preceded by His life in Mary's
womb, and by the four weeks of Advent, representing (it is said) the
passing of the four thousand years, and embracing the mysteries of the
Holy Infancy, Circumcision, Epiphany, Holy Name of Jesus, and the
Presentation.

_Second General Division, from Septuagesima till Easter_:--The death
of Christ preceded by the events of His public life, His fasting,