Nichiren lays it out succinctly and directly. In this letter, Nichiren exhorts his good friend Sairen Bo, an Tendai head monk converted to the teachings of Nichiren, to understand and consider deeply the insights of Nichiren's own enlightenment as conviction for his own resolve (Sairen-Bo's) and in his assistance to propagate Myohorengekyo. Nichiren makes it clear that all Buddhas of past and present throughout the teachings are the Buddhas of our own potential enlightenment and that the "true Buddha" is none other than MyoHoRenGeKyo. In addition that all Buddhas are in fact we ordinary people as we practice NaMuMyoHoRenGeKyo.