"Necessity is the mother of invention".
If someone is capable of doing something, and your goal is to prevent them from doing it, the worst thing you can do is to make it necessary for them to do it.
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If someone is capable of doing something, and your goal is to prevent them from doing it, the worst thing you can do is to make it necessary for them to do it.
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Just leave that damned prophesied hero alone. Don’t banish them, don’t attempt to kill them while they’re young, or send them on an impossible quest. Your entitled meddling is exactly what puts them on their path. Some level of boring coexistence may have been an option.
Also note that grandparent comment is about both folklore and current events.