score:2
I have no clue on how to go to find it
The main clue is to discern the underlying Latin text.
I also cannot understand the words
Me either ! But one doesn't have to be a Latin scholar to discern a spiritus meus in the lyrics.
Any ideas where should I look to find it?
The main idea is to get your hands on a searchable Latin bible.
Putting these three together, we finally arrive, after a few minutes of brainstorming, to the Vulgate version of:
Luke 1:47-48 et exsultavit spiritus meus in Deo salutari meo. Quia respexit humilitatem ancillae suae: ecce enim ex hoc beatam me dicent omnes generationes.
which is obviously part of the Magnificat.