[W]hat is the Kaidan, or Place for Learning Moral Precepts? This is easily understood, since we have already explained the Honzon and the Daimoku. It has been already pointed out that our bodies are identical with the body of the Buddha of Original Enlightenment. The reality behind appearances is the miraculous scene that is reflected, as in a mirror, by the enlightenment of the Buddha; in other words, that is apprehended by the Buddha’s intellect. Now we ourselves are the Buddha’s intellect, and it is the reality behind appearances which we must learn to apprehend. The intellect stands in the same relation to this “miraculous scene” as the cover of a vessel to the vessel itself. In each case, the former corresponds to the latter.
Doctrines of Nichiren (1893)