What should we say to someone who claims they can do a two-for-one kind of deal?
For instance, let’s say you’ve got a canonically Latin Catholic living in the United States. Let’s imagine that the Nativity of the Lord is on a Saturday. In the U.S. Christmas is a holy day of obligation no matter what.
This hypothetical Latin Catholic thinks to himself, “Hey, I’ll go to Mass in the evening on Saturday. Then I will have gone to Mass on Christmas, but I will also have gone to Mass the evening before Sunday. So I only need to go to Mass once!”
I don’t like this reasoning, and I don’t agree with it… but I don’t know how to **refute **it, especially in light of the legal and canonical principle that “Laws, even invalidating and disqualifying ones, do not oblige when there is a doubt about the law” (Canon 14). So how do we refute my hypothetical person’s claim that one Mass counts for both? Or are we unable to do so, and he’s right?