Those who can't... teach

The saying that "those who cannot, teach" have the misconeption that teachers, coaches, etc. are failures, and learning from the successful is more helpful. But what really is happening is that the successful are less likely to be successful teachers because they do not understand failure as well as those that have. 

This is an important lesson to learn because without having a check on this logical pitfall, this could lead us to problems like gambling addictions, not seeing the correct problem, solving the wrong problem (survivor bias), blindly follow seemlingly successful people to bigger failure (ponzi schemes), etc.

Reference

http://douglastclee.blogspot.com/2016/06/survivor-bias-logic-and-statistics.html