Original Vow in the context of "Infinite Life 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.