The idea of living at a late date in history is kind of an optical illusion. Every date in history is the latest moment of history so far. The illusion is caused by the fact that we are thinking only of the centuries that have already passed, not of those that are yet to come. So if you were at 1,000 A,D. you would be thinking of everything before you and not everything that would come afterwards. You would be justified in thinking that you were at a late stage of human history. Now this belief seems naive, when attributed to someone of that period, because we know that a lot more came to pass after that. But it seems justified to us. This could be a story for Borges, a kind of "refutation of time."
So too our condescension toward the past. Someone posted in Facebook about Unamuno's racism, and then I thought that everyone was racist back then. That is true, that we should understand the context of things like that. But our own moment could be just as prone to error, in other ways, as his. It doesn't excuse me to say, of some erroneous or toxic belief of mine, that others share it at my own historical moment, because who is to say that it is an early or too late time in our historical development? I think about it in terms of the advice I would give to my former self. Well, I can't listen to the advice that my future self could give me either.