Are there any official rules about Catholic faithful using Orthodox prayerbooks? For example, I really like the Jordanville prayerbook. The only thing that is in there that might be controversial is a prayer for the Monks of Athos. When I get to that prayer I just prayer for all Catholic religious or for the union of the Mount Athos monks to the See of Rome.
Are there any Canons dealing with this in Canon Law? Any prohibitions against it?
It seems to me that what St. Pope Pius X told Blessed Leonid Feodorov's community would apply, no?: "Nec Plus, Nec Minus, Nec Aliter".
Just wanted to know if there were any official rulings on this. The Jordanville book is the best I have found, but if it is prohibited to use it, I will stop.