"Shoe Kongocho-kyo" is a sutra (or sacred book) used as a reference for Diamond World Mandala, and within the Shingon sect and Tendai sect, it is said to clearly explain the principles of 'Sokushin-Jobutsu' (Attaining Buddhahood with the Present Body) in Esoteric Buddhism.
『初会金剛頂経』は金剛界曼荼羅の典拠となる経典で、真言宗や天台宗では密教の「即身成仏」の原理を明確に説いているとしている。