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What is the price of the past? Kind of leading question but I've found myself wondering at times about the old saying about those who don't know the past are doom to repeat it.
It's not that I don't think there is a good point to that view. However, when I look at the world around me I often see something that is vastly different from that view. I've come to summarize that as those who cannot let go of the past will never escape it. The implication is that not only those "clingy" people but also those around them will continue living whatever past it is they are attached to. As this is generally bad events of the past that means we get stuck living with these bad outcomes in the world.
So while keeping that knowledge of the past in mind may prevent repeating it, that might be accomplished by never actually having learned from or moved past the history. I'm unsure which is worse.