Later on Kukai reorganized To-ji Temple as the complete Esoteric Buddhism temple, and prohibited Buddhist monks other than Shingon Esoteric Buddhists from entering; and he made a strict regulation that only disciples selected by him could study only Buddhist scriptures and originals selected by him; however, "Rishu-kyo" was not included even in these.
空海は、その後東寺を完全に密教寺院として再編成し、真言密教以外の僧侶の出入りを禁じて、自分の選定した弟子にのみ、自ら選んだ経典や原典のみで修行させるという厳しい統制をかけたが、その中にさえ『理趣経』はないといわれる。