I have been reflecting on the concept of grit as explored in a scholarly fashion in this book by Angela Duckworth. Her TED video on grit is available here.Simply put, grit is the cultivation of passion with purpose and perseverance. The concept really resonated with me, particularly in my career as a physician and university professor.
Although grit is in part innate, it can be cultivated and developed. If you want to be grittier, join a group with a culture of grit. Also, leadership can breed a culture of grit through setting standards and providing motivation and support.
The theme is clear. High achievers are not necessarily the smartest or most connected, they are the grittiest of the lot.