Huh? So the rest of the bible couldn't be used for sermons? Sounds like this may have been misquoted or taken out of context.
If not, then I think this is a clear sign the Pope needs to be retired.
Sounds that way to me, too.
MOre likely the provision banned using "other stuff" INSTEAD of the appointed readings from Scripture--a practice to be found hither and yon around the Church of the PoofterWonkLiturgists.