"The most compelling evidence I have of the truth of Mr. Ikeda's words is the proof of my own life. In engaging in the process of continually struggling to renew my seeking spirit towards the Law (that is, in carrying out Buddhist practice)" -- SGI member
SGI's proof is the unverifiable proof of "person" that Nichiren taught us to abandon in favor of the verifiable proof of the words of the Law [Lotus Sutra]. Proof is found in how faithful one's words and behavior are to the Lotus Sutra and writings of Nichiren Daishonin. The words of the Lotus Sutra are the living body of Shakyamuni Buddha.