Grit by Angela Duckworth is a book that defines grit as “passion and perseverance for long-term goals,” arguing that it is a more significant predictor of success than talent or IQ. The book explains that high achievers are not necessarily those with the most talent, but those who have the stamina to keep going through failures and setbacks over time. Duckworth suggests that grit can be cultivated by focusing on passion, practice, purpose, and hope.