In the Rinzai Zen tradition, dharma transmission is the formal recognition that a disciple has fully realized the Zen teaching and is qualified to carry the lineage forward. It is described as a direct, mind-to-mind transmission of awakened understanding from master to disciple, beyond words and letters. This transmission acknowledges decisive awakening, the testing and confirmation of insight—often through rigorous kōan practice—and the maturity needed to guide others. It also functions as authorization: the disciple is empowered to teach independently, to transmit the dharma in turn, and to stand within the unbroken line traced back to Shakyamuni Buddha through the Rinzai patriarchs. In this sense, dharma transmission is both an inner seal of realization and an outer certification within the institutional life of the school.

Hakuin Ekaku’s reception of dharma transmission unfolded through a demanding and somewhat unconventional path. He trained under several masters and experienced an initial awakening under the fierce guidance of Shōju Rōjin (Shōju Etan), who subjected him to severe testing and repeated kōan challenges. Hakuin continued intensive practice and further deepened his realization, undergoing additional examinations of his understanding by senior Rinzai masters. Over time, his awakening was acknowledged as complete and his grasp of the kōan curriculum recognized as sufficient. On this basis, he ultimately received formal dharma transmission in the Rinzai lineage, traditionally traced through Shōju’s line. That transmission became the foundation for his later role as a major heir of the Rinzai tradition and as a powerful force in its revitalization, exemplifying how authentic realization and institutional recognition can converge in a single life.