"Explaining the heart of the Lotus Sutra, the Universal Worthy Sutra says, “Without either cutting off earthly desires or separating themselves from the five desires . . .” And the Great Teacher T’ien-t’ai’s Great Concentration and Insight reads, “Earthly desires are enlightenment; the sufferings of birth and death are nirvana.” Explaining how the Lotus Sutra surpasses all the rest of the Buddha’s lifetime of teachings, Bodhisattva Nagarjuna’s Treatise on the Great Perfection of Wisdom says, “[The Lotus Sutra is] like a great physician who can change poison into medicine.” This passage means that while a lesser physician cures illness with medicine, a great physician cures grave illness with virulent poison."
From Gosho "The Receipt of New Fiefs" (The Writings of Nichiren Daishonin Volume I, page 946)
From Gosho "The Receipt of New Fiefs" (The Writings of Nichiren Daishonin Volume I, page 946)