Jujushinron (Ten Stages of Mind Development) (十住心論)

"Jujushinron" (Ten Stages of Mind Development), or "Himitsu Mandala Jujushinron" (Ten Abiding Stages on the Secret Mandalas) to be precise, is one of the most famous writings by Kukai, which was written around 830 and describes the system of Shingon Esoteric Buddhism in response to the imperial order of Emperor Junna. Total 10 volumes.

It establishes a system by dividing human mind into 10 stages and assigns typical thoughts to each of them. It stipulates that Shingon Esoteric Buddhism is definitely the highest state that a human mind can reach.

Ishoteiyoshin
Mind tainted by Bonno (earthly desires)
Gudojisaishin
Awakening of morality, Confucian state
Yodomuishin
Otherworldly minded, Indian philosophy, state of the thought of Laozi and Zhuangzi
Yuiunmugashin
State of Shomon (person who listens to teachings) in Hinayana Buddhism
Batsugoinshushin
State of Engaku (self-enlightened saints) in Hinayana Buddhism
Taendaijoshin
State of Yuishiki (consciousness-only) or Hosso sect in Mahayana Buddhism
Kakushinfushoshin
State of Chugan (Intermediate) or Sanron Sect in Mahayana Buddhism
Ichidomuishin
State of Tendai-shu sect in Mahayana Buddhism
Gokumujishoshin
State of Kegon sect in Mahayana Buddhism
Himitsushogonshin
State of Shingon Esoteric Buddhism

"Hizohoyaku" briefly describes the content of "Jujushinron."