It may seem counterintuitive, but one of the biggest barriers to working toward mastery is perfectionism. In our leadership research, we’ve learned that achieving mastery requires curiosity and viewing mistakes and failures as opportunities for learning. Perfectionism kills curiosity by telling us that we have to know everything or we risk looking “less than.” Perfectionism tells us that our mistakes and failures are personal defects, so we either avoid trying new things or we barely recover every time we inevitably fall short.