I have taken a close look at your letter. The Buddha in the Nirvana Sūtra says: “People who study Buddhism number as many as the particles of dust upon the earth; however, those that really go on to become Buddhas number as few as the particles of dust that can rest upon one’s fingernail.” After contemplating the difficulty of attaining Buddhahood, there is something I have observed with some conviction. It is possible for one not to be able to correctly learn Buddhism despite one’s study of Buddhism because of one’s stupidity; or, though one may be very intelligent, it is possible that one may go awry and not be able to correctly learn Buddhism as a result of studying under an incompetent teacher.

Misawa-shō, A Letter to Lord Misawa of Suruga, Writings of Nichiren Shōnin, Doctrine 2, Page 239