Mistakes.............................

     "Everyone makes mistakes.  The main difference is that successful people learn from them and unsuccessful people don't.  By creating an environment in which it is okay to safely make mistakes so that people can learn from them, you'll see rapid progress and fewer significant mistakes."

     "Mistakes will cause you pain, but you shouldn't try to shield yourself or others from it.  Pain is a message that something is wrong and it's an effective teacher that one shouldn't do the wrong thing again."

-Ray Dalio,  Principles