Daisaku Ikeda addresses the themes expressed in Nichiren's writings. Throughout his life, Nichiren Daishonin wrote several treatises and numerous letters addressed to his disciples, which express his deep conviction to fulfill the Buddha's mandate, that is, to spread peace in the world through the realization of happiness for every living being. Ikeda and the leaders of the Soka Gakkai Study Department address the themes expressed in Nichiren's writings, clarifying the essential concepts for realizing the Buddha life-state in today's world. Finally collected in a single volume, these dialogues are an essential work for understanding Nichiren Daishonin's Buddhism.