Nichiren Shu regards Nichiren's own writings—called "" or "Goibun" (御遺文)— as commentaries or guides to the doctrines of Buddhism. They include the Five Major Writings of Nichiren in which he establishes doctrine, belief, and practice, as well as many pastoral letters he wrote to his followers. Furthermore, Nichiren Shū is selective about which "Gosho" writings it deems authentic. Many "Gosho" writings that are accepted by Nichiren Shōshū are not accepted as genuine by Nichiren Shū on grounds that scholars have not verified their authenticity. The primary reason for this dispute arises over an inability to verify those various disputed writings as actually having been authored by Nichiren. This does not mean those "Gosho" or alleged oral transmissions (including the "Ongi Kuden") are rejected by Nichiren Shū, but it does mean that they are viewed as secondary to authenticated materials and while it is acknowledged they may have pastoral value they cannot be definitively asserted as Nichiren's own teachings.