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Well, isn't "teaching wisdom" technically "protection from folly"?

hmm ... actually ... no. Wisdom is not something I learn from being protected from a folly but from having the chance to practice my mistakes. Once I practice, I gain in experience - when things go wrong, I've learned, when things go right, I've learned, too.

I don't think that wisdom can be taught, but it can develop the more experienced one becomes in risking mistakes :)

Every beginner is a fool.

Perhaps small follies (with proper guidance) can teach you to avoid larger follies?

Yes, why not? I learn from my follies, so it's the folly which teaches.
But then ... a folly is a folly, I cannot think in terms of small or large, at least, I would need an example. Do you have one for me?

Memory of a childhood panic about an unexpected change might help you prepare for more significant unexpected changes later in life.

I'm suggesting that it's possible to help others see the connections between seemingly unrelated feelings and events, perhaps mitigating some of the anxiety associated with the learning process.

Very much so. Great quote.