This volume, an updated edition of the book previously published under the title “What Is the Human Revolution?”, contains various excerpts from the writings of Master Ikeda, selected from a wide variety of sources spanning many decades, including speeches, essays, lectures, and dialogues. The book explores the principles of Nichiren Daishonin’s Buddhism and their practical application in daily life, with a particular focus on the concept of the “human revolution”—that inner transformation which is the key to achieving authentic happiness and thereby contributing to the building of a peaceful and harmonious society. As Master Ikeda explains: “To carry out one’s human revolution means to open one’s eyes wide and look beyond one’s narrow daily world, striving to dedicate one’s actions to something higher, deeper, and greater.”