It is considered that originally written scriptures did not follow the style of Buddhist scriptures; they were made as examples to express raisan-mon (messages which expresses faith in the Buddha, Dharma and Sangha) or Giki (regulations prescribing Esoteric Buddhist ceremonies, incantations and services, and the iconography and standards to be used to make Buddhist statues and paintings).
本来の本経が、経典の体裁をとっておらず、はじめ、礼讃文や儀軌の類として制作された経緯に拠るものと考えられている。