One gauge of how good someone is at their job is how well they recover from mistakes. You can tell how great of a guitar player Neil Young is by seeing how well he recovers from a misplayed note in a solo — somehow, he actually makes it sound good. Likewise, chess grandmasters are excellent at making their mistakes as difficult as possible for their opponents to exploit and so turn many losses into draws.
In our jobs we often make mistakes when it comes to project management, hiring, putting the wrong people into a big role, politics, architecture, and so many other things. Being able to quickly realize that a mistake has been made, and somehow having the mental fortitude to leave the past behind and re-approach the current situation with a fresh perspective is what sets apart amateurs from professionals.