Unfortunately, the Courage Wolf's existence proof for "people wiser than you" is nonconstructive: he has failed to give evidence that any particular person is wiser, and thus should be trusted.
How to recognize someone wiser than you is indeed left as an exercise for the reader. And, yes, there will always be uncertainty, but you handle uncertainty in tradeoffs all the time.
Are you seriously claiming the Weasely twins are the wisest characters in HPMoR?
Another month, another rationality quotes thread. The rules are: