Chigi was a scholar priest who originated a doctrine based on Hokke-kyo sutra, Makahannya haramikyo sutra and Daichidoron (Commentary on the Great Wisdom Sutra) that were translated by Kumaraju as well as Nehangyo sutra, advocated Kyoso hanjaku (theory on the history of sutra establishment) based on Goji hakkyo, which deems Hoke-kyo sutra as paramount, and preached to become Buddha through shikan (Tendai Meditation).

In view of the fact that Kumaraju attached importance to Hoke-kyo sutra, Makahannya haramikyo sutra and Daichidoron, it can be said that the foundation of the Tendai Sect was triggered by Kumaraju.

It is said that Ryuju in India wrote "Daichidoron," a commentary on the Prajnaparamita-sutras during the second to third centuries, and there is a theory assuming that Hannya Shingo was established around this time.

In Vol. 33 of Nehan-kyo Sutra (The Sutra of the Great Nirvana) and Vol. 56 of Daichidoron, there is a description that Taishakuten was called Kyoshika （Kauśika）when he was a human.

Daichidoron (Commentary on the Great Wisdom Sutra)

As a revisioner his works included "Kunten Tendai Sandaibu Hosei ki" (Helpful Readings of the Three Great Tendai Scriptures), "Commentary on the Great Wisdom Sutra," "The Interpretation to understand the Nirvana Sutra," "Hoon Jurin" (Fa-yuan zhu-lin, the Chinese encyclopedia of Buddhism), "Shakumon Shofukuku gi," "The Complete Works of Yuan Hong-dao," and "The Treasury."

Bekkaku Honzan (special head temples): Kakusho-in Temple (Ukyo Ward, Kyoto City), Kozan-ji Temple (Tanba City, Hyogo Prefecture), Yakuo-ji Temple (Nishi Ward, Hiroshima City), Daisho-ji Temple (Mimasaka City, Okayama Prefecture), Kozan-ji Temple (Ibara City, Okayama Prefecture), Hagiwara-ji Temple (Kanonji City, Kagawa Prefecture), Kannon-ji Temple (Kanonji City, Kagawa Prefecture), Hoju-ji Temple (Kanonji City, Kagawa Prefecture), Gokuraku-ji Temple (Sanuki City, Kagawa Prefecture), Jizo-in Temple (Tokushima City), Kogan-ji Temple (Shikokuchuo City, Ehime Prefecture), Daihio-in Temple (Maebaru City, Fukuoka Prefecture), Daichi-in Temple (Sasebo City, Nagasaki Prefecture)

After Tan-luan became a monk, he read many books including Four Treatise ("Madhyamaka-karika [Fundamental Verses on the Middle Way]," "Dvadasanikaya Shastra [Twelve Gate Treatise]," "Commentary on the Great Wisdom Sutra, " and "Shatashastra [One Hundred Verses Treatise]") by Nagarjuna and his disciples, and the Sutra of the Great Nirvana, to learn about buddhata.

"Daichidoron" (Commentary on the Great Wisdom Sutra) argues that 'at rinju, those whose color changes to black will go to Hell,' and "Makashikan" (Mahayana Practice of Cessation and Contemplation) by Zhiyi of the Tendai sect in China also discusses that 'a change of one's color to black is compared to the shadow of Hell.'

However, since there have been disputes among scholars around the world over the value of the Nirvana Sutra, the scholars for generations need to examine it closely.

"Daichidoron" (Commentary on the Great Wisdom Sutra) says as follows:

Daichi

Daichi (1290 - January 18, 1367) was a Buddhist priest of the Sotoshu sect from the late Kamakura period to the period of the Northern and Southern Courts.

A similar text is found in "the Volume 32 of Daichidoron (the Commentary on the Great Wisdom Sutra).

The volume 24 of the "Daichidoron" also says:

Therefore, it is assumed that Kumaraju converted the nine factors of the universe such as "the embodiment, the dharma (function), the potency, the primary cause, the secondary cause, the effect (result and recompense), the nature, the hindrance (form) and expedient means to open a way through (complete fundamental whole)" into the junyoze.

"Daichidoron" 3 lists the followings as Tenjikugoshoja:

The "Nihon Shoki" (Chronicles of Japan) gives the start date of the system and lists the twelve ranks.

In "Jogu Shotoku Ho-o Teisetsu," a biography of Prince Shotoku, the ranks are given as "Shaku Juniku, Daitoku, Shotoku, Dainin, Shonin, Dairai, XX Daishin, Shoshin, Daigi, Shogi, Daichi, Shochi."

Daichi (Greater Knowledge) (black)