Kyōgyōshinshō in the context of Sutra

Jōdo Shinshū (浄土真宗, "The True Essence of the Pure Land Teaching"), also known as Shin Buddhism or True Pure Land Buddhism, is a Japanese tradition of Pure Land Buddhism founded by Shinran (1173–1263). Shin Buddhism is the most widely practiced branch of Buddhism in Japan, and its membership is claimed to include 10 percent of all Japanese citizens. The school is based on the Pure Land teachings of Shinran, which are based on those of earlier Pure Land masters Hōnen, Shandao and Tanluan, all of whom emphasized the practice of nembutsu (the recitation of Amida Buddha's name) as the primary means to obtain post-mortem birth in the Pure Land of Sukhavati (and thus, Buddhahood).

Shinran taught that enlightenment cannot be realized through one’s own self-power (jiriki), whether by moral cultivation, meditation, or ritual practice, but only through the other-power (tariki) of Amida Buddha’s compassionate Vow. Therefore, in Shin Buddhism, the nembutsu is not a meritorious deed or practice that produces merit and liberation, but an expression of joyful gratitude for the assurance of rebirth in the Pure Land, which has already been granted by Amida’s inconceivable wisdom and compassion. Doctrinally, Jōdo Shinshū is grounded in Shinran’s magnum opus, the Kyōgyōshinshō (Teaching, Practice, Faith, and Realization), which presents a comprehensive exegesis of Pure Land thought based on Indian and Chinese Mahāyāna sources. Shinran’s synthesis reframes the Pure Land path as the culmination of Mahāyāna Buddhism, emphasizing ideas like true faith (shinjin), other-power, the abandonment of self-power, the nembutsu of gratitude, and the all-embracing compassion of Amida Buddha's Original Vow.

Shinran (親鸞; Japanese pronunciation: [ɕiꜜn.ɾaɴ], May 21, 1173 – January 16, 1263) was a key Japanese Buddhist figure of the Kamakura Period who is regarded as the founder of the Jōdo Shinshū school of Japanese Buddhism. A pupil of Hōnen, the founder of the Japanese Pure Land movement, Shinran articulated a distinctive Pure Land vision that emphasized faith and absolute reliance on Amida Buddha’s other-power.

While Shinran trained as a Tendai monk on Mount Hiei, he lived much of his life as a married Buddhist teacher unlike other Kamakura Buddhist reformers, and he described himself as "neither monk nor layman". Shinran's major work, the Kyōgyōshinshō (Teaching, Practice, Faith, and Realization), is a systematic exposition and defense of Pure Land doctrine. Shinran taught that liberation arises from the entrusting mind (shinjin) awakened through Amida's compassionate power, not from any merit or power of one's own. His interpretation profoundly reshaped the course of Japanese Buddhism and continues to influence East Asian religious thought.