An Introduction to the Buddhist Canon: Japanese Works=大藏經入門 -- 日本撰述部
香港, 中國 [Hong Kong, China]
Taisho No. 2427. Published in Taiwan by Charng Chuen Shuh (常春樹[Evergreen]): Shin-diann, Taipei, 1988, 231 pages. Compiled by Tarn Guang-ming (譚光明).
This "Treatise on the Differences between the Two Teachings of Exoteric and Esoteric Buddhism," also known simply as Ni-kyo-ron ("Treatise on the Two Teachings")，sets forth, as is implied by the title，a comparative study of the qualitative differences between the two branches of Buddhism，'Exoteric Buddhism' and 'Esoteric Buddhism'; Kukai concludes that Esoteric Buddhism be the supreme teaching.
The points discussed in this work are：the buddhas said to have revealed the two teachings, the contents of the teachings, the period of time necessary for attaining buddhahood，and the benefits deriving from the two teachings. With the help of quotations from many scriptures, Kukai demonstrates that Esoteric Buddhism be superior to Exoteric Buddhism in regard to all of the above points.