“Grit, in a word, is stamina. But it's not just stamina in your effort. It's also stamina in your direction, stamina in your interests. If you are working on different things but all of them very hard, you're not really going to get anywhere. You'll never become an expert.”

American psychologist and author

Angela Lee Duckworth is an American psychologist, academic, and popular science author. She is the Rosa Lee and Egbert Chang Professor of Psychology at the University of Pennsylvania. Her work focuses on grit and self-control, subjects she has studied and written about for a wide audience. She also founded Character Lab, a nonprofit dedicated to advancing the science and practice of character development.