In the "Immeasurable Life Buddhist Sutra and Teachings," Bodhisattva Dharmakara (the name of Amitabha during his ascetic period) observed that all people appeared to be visited by adversity and distress and, took a vow that he would try to have all become like Buddha to make people happy.
『無量寿経仏説無量寿経』には、すべての人が悲しみ苦しみにあえいでいる姿をつぶさに観察した法蔵菩薩（阿弥陀仏の修行時代の名前）は、この人たちすべてが仏となって幸せになってもらいたいと誓いを立てた。