From the The Enchiridion Of Indulgences, item 61: A partial indulgence is granted to the faithful, who devoutly recite the hymn Come, Holy Spirit, Creator blest. But a plenary indulgence is granted, if the hymn is recited publicly on the 1st of January or on the feast of Pentecost.
Veni Creator Spiritus
Come, Holy Spirit, Creator blest,
And in our souls take up your rest;
Come with your grace and heavenly aid
To fill the hearts which you have made.
O Comforter, to you we cry,
O heavenly gift of God Most High,
O fount of life and fire of love,
And sweet anointing from above.
You in your sevenfold gifts are known;
You, finger of God's hand we own;
You, promise of the Father, you
Who do the tongue with power imbue.
Kindle our senses from above,
And make our hearts o'erflow with love;
With patience firm and virtue high
The weakness of our flesh supply.
Far from us drive the foe we dread,
And grant us your peace instead;
So shall we not, with you for guide,
Turn from the path of life aside.
Oh, may your grace on us bestow
The Father and the Son to know;
And you, through endless times confessed,
Of both the eternal Spirit blest.
Now to the Father and the Son,
Who rose from death, be glory given,
With you, O holy Comforter,
Henceforth by all in earth and heaven. Amen.