I like the theory that says "there is no failure only feedback" that comes from NLP (Neurolinguistic Programming.) There is much truth in that. But, like all truth, it applies and then it doesn't. Context matters.
There are mistakes that we can make that we do not learn from because there is no second chance. Some mistakes, life threatening or relationship ending, offer no other chance.
So as the sarge used to say at the beginning of every "Hill Street Blues" episode, "let's be careful out there."
-- doug smith