This book is an impressive work that concerns the influence and interaction of the different psycho-social factors characteristic of positive psychology in language education. Furthermore, as a Ph.D. student, it has inspired me to develop my own research on the role of positive psychology and learner emotions in education. Pre-service and in-service language teachers, researchers, and educators in both naturalistic and instructed second language acquisition (ISLA) settings will also benefit from this book. (Yujing Qiu, Educational Review, Vol. 74 (3), 2022)