A other thing we need to talk about is how far we go with the incomprehensible between hermetic magic and holy magic as it affect how we will spend our BP for the covenant.
I already started the question here: https://forum.atlas-games.com/t/rop-d-questions/11640/1 because what is writen in the book is unclear and there is no official errata so far.
1.) One can read the text writen at RoP:D 67 that only the lab text are of (nearly?) no use between Holy and Hermetic magic. (Should be quite easy to handle for our covenant)
2.) I personal think the text was aimed for Art and Lab text that are incomprehensible between Holy and Hermetic magic. (Need some more planing with our covenant BP and books but should still ok to handle)
3.) We also could say certain ability beside the art and lab text are incomprehensible but for this we need to be clear right from the start about each single ability (Would need quite a lot of preplaning for this)
4.) The most radical interpretation would be a complete incomprehensible what means all Ability as well. (That would be just crazy because then even a Theology or Artes Liberales summa could be incomprehensible depending who have written it)