Since those whom we manage look to us for guidance, we should think of ourselves as teachers. We teach others what we have learned so that knowledge can be leveraged through their performance.
The market is a rude place, indifferent to our very existence let alone whether we succeed or fail. Perfection has never been attainable by mere mortals. Excellence is possible, but only those with high standards are capable of achieving it and only as a result of positive critical evaluation of our own efforts and those we manage.
Humans work best when they know that there is a safe harbor where redemption is available to those who fail while trying their best and where they will be encouraged to continue to take initiative in the quest for excellence.