As an introvert, this book really jives with me. However, its greatness lies in the parallel and complex contexts of introverts and extroverts, highlighting the strengths and weaknesses of both, and the importance of remembering that nothing is set in stone (at least to a certain genetic point we can easily change who we are). The most interesting part to me was the discussion of Kagan’s studies of high-reactive children and being able to tell from very young how people might turn out. The advice for parents and teachers is also extremely interesting and useful. The most important message and reason why everyone should read this book, no matter how they think they may identify, is KNOW THYSELF.