That's a really good question, Jack. And there are a lot of conservative Catholics who are adamant it should not change. There were a bunch of these in the recent Synod on the Family arguing against whether divorced couples should be fully part of the community or not.

I disagree with them, as you might imagine. The Church, to my mind [and this is true of Judaism and Hinduism and all the rest] is about trying to understand the relationship whatever-God-is and the world. And therefore, as the world changes, the relationship changes even if God does not. What happened in the past may well have made sense to the people at the time, but we should not preserve it just because of that if it no longer makes sense today.