The document discusses Angela Lee Duckworth's theory that grit, not innate talent or intelligence, is the key to success. It introduces the concept of a growth mindset, where success is based on effort rather than genetics, and references Duckworth's TED talk where she presents research showing that grittier individuals tend to work harder and achieve more over time than peers with equal talent but less grit. The document questions what truly determines success and suggests that grit may be the secret ingredient.