This episode of Deep Dive explores "Treatise on All Phenomena as Ultimate Reality," discusses Nichiren's reinterpretation of the Tendai Buddhist practice of Shikan, which consists of calm (shamatha) and insight (vipassana). Historically, Shikan required lengthy, structured monastic meditation, but Nichiren made this path accessible to everyday people by teaching that single-minded chanting of Namu Myo Ho Ren Gay Kyo itself embodies both calm and insight. The treatise honors the Tendai tradition while asserting that, in the present age, chanting the Daimoku is sufficient to realize ultimate reality, contrasting the arduous classical methods with Nichiren's immediately accessible practice. This shift is presented as a practical gift to ordinary practitioners, demonstrating how faith and chanting replace the need for formal contemplative stages. The text concludes that chanting carries the full merit of Shikan, offering a direct path to awakening for all people.