Thanks for writing this! I used to ignore the “grit” discussion precisely because of the definition very close to perseverance, which is obviously needed. Now I’m glad to hear that scientists have actually confirmed the findings I observed casually among the young people I mentored. Not sure if I was using the right words to describe them, but I call the two factors playing-to-one’s-strength and stretching-beyond-comfort-zone. While stretching-beyond-comfort-zone is a combination of passion and perseverance, playing-to-one’s-strength is more relevant to Marie Curie’s quote above “confidence in ourselves” i.e. the gift that we have.