attributed to David in the Septuagint and Vulgate. Its Latin form in the
invitatory differs slightly from the Vulgate text. The Breviary retains
here the text of St. Jerome's revision and the Vulgate contains the
second and more correct revision.

_Hymns_. The hymn is an answer to the invitation given to us in the
invitatory, to praise God and to rejoice with Him. It is a song of joy
and praise. Hymns were introduced into the Divine Office in the Eastern
Church before the time of St. Ambrose (340-397). To combat the Arians,
who spread their errors by verse set to popular airs, St. Ambrose, it is
said, introduced public liturgical hymn-singing in his church in Milan,
and his example was followed gradually through the Western Church. (See
Note A, _infra_.)

The final stanza of a Breviary hymn is called the doxology ([Greek:
doxa] praise, [Greek: logos] speech), a speaking of praise. Hymns which
have the final stanza proper, the _Ave Maris stella_, Lauds hymn of the
Blessed Sacrament, Matins hymn for several Martyrs, the first Vesper
hymn of the Office of Holy Cross, and the Vesper hymns of St. Venantius
and St. John Cantius, never change the wording of the stanza.

But, _where the metre of the hymn_ admits such a change as possible in
the last stanza.

(a) From Christmas to Epiphany _Jesu tibi sit gloria, Qui natus es de
Virgine_ is inserted in all hymns, even on saints' offices.

(b) From Epiphany till end of its octave, _Jesu tibi sit gloria, Qui
apparuisti gentibus_.