Over my long life @leveuf ...
"... maybe the time "wasted" in the past was necessary in some way."
... while it would be nice if I never made a mistake (like wasting time ...) or created a problem, for myself or others, I don't believe that is possible. So ... Hopefully you and I, as we live life and "learn the hard way" where we have erred, we can at least look back and say "we learned something" for the next time! 👍
As there is almost inevitably a "next time" ... 😉
You've said it in a much better way! Learning is a big treasure when we are decide to do it! Experience and perspective could blend perfect for a better future, as you say!! 🙂
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