The great mystery isn't that people do things badly but that they occasionally do a few things well. The only thing that is universal is incompetence. Strength is always specific! Nobody ever commented, for example, that the great violinist Jascha Heifetz probably couldn't play the trumpet very well.
Peter DruckerMost people think they know what they are good at. They are usually wrong... And yet, a person can perform only from strength.
Peter DruckerThe paradox of the prophet: his very success is his failure. The prophet whose time has come no longer shocks; he entertains.
Peter Drucker