As God as my witness, I honestly believed that priests always have been free to celebrate the Tridentine Mass. So I'm a little confused -- I always imagined that a parish could set up "okay, we'll be doing a Tridentine Mass on Sundays at 7, but then an English one after that at 9, so you can pick the one you want to come to." Hasn't this always been the case? Or is this ruling now saying that on any given mass, a priest can just say, "Oh, I feel Latin today" and just spontaneously break it out?