Why there is no real proof of the efficacy of the prayers of Soka Gakkai members

"Ignorant and simple-minded people have failed to look to the clear, correct dictates of the sutras and have vainly believed instead in the secret transmissions that have been orally handed down from master to disciple. Though they claim to be practicing the prayer of the 'secret Law,' there is no real proof of its efficacy. "So it is that Heaven and Earth show signs of strange natural disasters, and catastrophes are rife in our land. It is all because true Buddhism is not distinguished from false Buddhism and wise priests [here, a reference to Nichiren Daishonin] are not distinguished from foolish ones." (Shijukuin Moshijo, GZ-848)