Genshin (源信; 942 – July 6, 1017), also known as Eshin Sozu, was the most influential of a number of Tendai scholars active during the tenth and eleventh centuries in Japan. He was not a wandering evangelist as Kūya was, but was an elite cleric who espoused a doctrine of devotion to Amida Buddha which taught that because Japan was thought to have entered mappō, the "degenerate age" of the "latter law," the only hope for salvation lay in the reliance on the power of Amitabha. Other doctrines, he claimed, could not aid an individual because they depended on "self-power" (jiriki), which cannot prevail during the chaos of the degenerate age, when the power of another (tariki) is necessary. In his approach to rebirth in the Pure Land, Genshin emphasized visual meditation practices, where later Pure Land sects favored verbal recitations such as the nembutsu. Genshin's doctrine is documented in his magnum opus, the Ōjōyōshū (往生要集 "Essentials of Birth in the Pure Land"?), which in later copies of the text came complete with graphic depictions of the joy of the blessed and the suffering of those doomed to chaos.
Genshin's influence in contemporary Japanese culture today is primarily due to his treatise, Ōjōyōshū, particularly the graphic descriptions of the Buddhist hell realms (地獄 jigoku), which inspired a genre of horror and morality stories. The 1960 Japanese film Jigoku was influenced by Genshin's Ōjōyōshū among other works. In Jodo Shinshu Buddhism, he is considered the Sixth Patriarch.
Genshin is credited as the founder of the Enshin school of Tendai Buddhism, and for espousing the "original enlightenment" teaching, or hongaku (本覚), where one is originally enlightened, but unaware of it. In all, Genshin left more than 30 works which continue to influence Pure Land thought today.