Introit
Rejoice we all in the Lord, as we keep festival in honour of the Blessed Virgin Mary: whose solemnity makes angels joyful and sets them praising the Son of God. V. Joyful the thoughts that well up from my heart, I shall speak of the works of the King (Ps 44:2).
Gaudeamus is a magnificent festal chant originally composed for the virgin martyr Saint Agatha, and then adapted to other occasions. It is used on a number of other feasts of the Blessed Virgin Mary, making it familiar enough to be sung with a certain jubilant ease. The gentle balancing of the first mode melody evokes the ceaseless, sweeping joys of the heavenly liturgy celebrated by "the voice of many angels, numbering myriads of myriads and thousands of thousands" (Ap 5:11). The verse, drawn from Psalm 44, the exuberant messianic wedding song, is placed in the mouth of the Church, the Bride of Christ, as she declares the wonders wrought through the intercession of the Virgin Mother of Perpetual Help.
Collect
Lord Jesus Christ, by whose gift Mary Thy Mother, that Mary whose glorious image we revere, is our Mother too, and ready at all times to succour us, we pray Thee grant that we, who earnestly beg her maternal help, may be counted worthy to reap through all eternity the fruit of Thy redeeming work. Thou who art God living and reigning with God the Father, in the unity of the Holy Spirit, forever and ever.
As are many liturgical prayers of recent composition, the Collect is addressed to Christ rather than to the Father. Orations addressed to the Son are exceptional in the Roman liturgy; in the East they are the norm. While it is not traditional to direct the Collect to the Son in the classic Roman liturgy, there are moments when it can be quite fitting to do so. The feast of Our Mother of Perpetual Help may be one of those moments.
The Collect refers straightaway to the gift of the Virgin Mary's motherhood extended to every disciple of her Son, the very mystery that will be evoked in the Gospel; and to the veneration of her glorious image. It acknowledges that Mary is perpetually ready to help us, and asks that, through her motherly power, we may reap through all eternity the fruit of Christ's redemption. The last phrase is certainly an allusion to the charism of the Redemptorists, custodians of the miraculous icon and, in the tradition of Saint Alphonsus, tireless preachers of Mary's universal mediation and inexhaustible clemency.