Without doing much in the way of research, which would spoil the game, I think the quote is urging people not to privilege the beliefs of the culture they live in. For example, many popular beliefs of the 1900's are clearly incorrect when viewed in hindsight; the logical conclusion is that, in a hundred years, many popular beliefs today will be seen as clearly incorrect by those future generations.

I can think of a few likely candidates off the top of my head. And sorry for the sesquipedalian loquaciousness. I keep trying to stop, but I can't!