Arcanum by Pope Leo XIII is one of the most prescient things I have come across, two other big ones are ‘That Hideous Strength” by CS Lewis, along with ‘Humanae Vitae” by Pope Paul VI. Here’s another link, from the Vatican.
In my opinion it is doubtful that so many would accept impossibilities like ‘gay marriage’ if they hadn’t been conditioned to believed that the state defines marriage in the first place. To many it is simply a contract consisting of strictures and benefits from the state between any parties the state deems to give little pieces of paper, and can be broken and resumed as long as the state gives its OK. So they will accept whatever judges, pols, or the thinks marriage can be at any one time pretty easily, at least in the modern era.
Freegards