Christopher Walker has set this song to his arrangement of the Skye Boat Song.
OCP suggests it for confirmation or marriage but it would find a place in more usual liturgies in times of trouble with a need for reassurance.
The sheet music can be purchased at OCP, where the text is in their preview. The tune itself is public domain and available all over the internet. This arrangement is in the same key as CWB II.
My backing has unforgivable fake bagpipes.
Interestingly, the same tune is used for a song called “Spirit of God, Unseen as the Wind” written by Margaret Old from 1971. Perhaps the Skye Boat Song suggests the Holy Spirit on action.