Sandaihiho was created as the root of Dai-Gohonzon of Honmon no Kaidan, which was said to have appeared before the founder of the sect on October 12, 1279, and if one opens this it will become Rokudaihiho (the Six Great Secret Dharmas) of the principal images of human and dharma (Koto-no-kaidan and Gi-no-kaidan) and the Nichiren chants of belief and practice; but if one opens it more, it becomes all 84,000 Homon in Buddhism.
弘安二年（1279年）10月12日宗祖所顕と伝えられる本門戒壇の大御本尊を根源として三大秘法は生み出されているのであり、これを開くと人と法の本尊・事と義の戒壇・信と行の題目の六大秘法となり、さらに開くと仏教八万四千の法門すべてになる。