This is Ernest Sand’s sung prayer to the Holy Spirit.
The range of the antiphon looks a struggle but maybe taking the key down a few semitones might help. The verses are chant but my metrical soul couldn’t handle that so I have made them fit to 4/4 strict time.
The antiphon is indeed a prayer to the Holy Spirit:
Come, Holy Spirit, fill the hearts of your faithful.
And light up in them the fire of your love.
Send forth your Spirit and they shall be created.
And you will renew the face of the earth.
I’m not sure why “light up” was preferred to “kindle”. I couldn’t find any sheet music to download but it is in other collections if you are looking on the second hand market.
The verses are selections from Psalm 104 in the Grail translation:
Stanza 1 – Verses 1ff
Stanza 2 – Verses 24ff
Stana 3 – Verses 29ff
Stanza 4 – Vereses 33ff
I did these backing some time ago and I’m not sure why I picked this style.