Just what it says on the tin. I took the florid gregorian original and adapted it nearly note-for-note to the translation provided in the Gregorian Missal (with very minor tweaks).

I've also transcribed the latin original into modern stemless notation, which may be helpful for more advanced singers who still aren't comfortable with square notes, or organists tasked with accompanying a schola.

https://catholicsacredmusic.com/blog/iustorum-anim-but-in-english-2026