This episode of Deep Dive explores an essay by Nichiryu Mark Herrick, focuses on Nichiren's perspective regarding the supremacy and necessity of the Lotus Sutra within the entirety of the Buddha's teachings. The text establishes that the true significance of the Lotus Sutra cannot be grasped unless it is studied in the context of all previous sutras, which serve as preparatory and provisional teachings leading to the ultimate truth. Through historical classification systems, Nichiren viewed the earlier teachings as a "preface" and skillful means (upāya) that culminated in the Lotus Sutra, which acts as the "universal key" revealing the true meaning of all prior texts. Consequently, while earlier sutras can be understood individually, the Lotus Sutra requires an integral vision to appreciate its role as the completion and illumination of the whole Buddhist Dharma.