This book is the life’s work of the author, an English teacher who has dedicated his career to the practice of education rooted in Japan’s traditions of kokoro no kyoiku (education of the heart), spiritual discipline, and moral instruction. Believing that true education is not about cramming knowledge but about cultivating the heart, the author also embraced an approach that draws on ki—the vital life energy that permeates nature—and applied it to the classroom and to each child’s growth. Grounded in the philosophy of unifying mind and body, the author has consistently taught the importance of harmonizing one’s inner self, living daily life with a positive flow of ki, and fostering gratitude, focus, and moral strength. By awakening children’s motivation (yaruki), this approach revives essential values that modern education often neglects. This is a book for all teachers, parents, and educators who wish to nurture children’s hearts to be strong, kind, and resilient.