GRIT A Complete Summary! Grit, also known by its full name, Grit: The Power of Passion and Perseverance is a book written by Angela Duckworth. The book definitely has an unusual name, but its subject is not unusual: it simply discusses the power of perseverance and passion. Many people want to know the "big secret" that would either guide them to success or to the genius that lies behind big accomplishments. The author offers her readers exactly that.