In his treatise, Nichiren criticized other competing Buddhist sects, arguing that these sects, including Jodoshu (Pure Land Buddhism), which led people to believe in false teachings (evil teachings) other than the Lotus Sutra, the only true teachings of Buddhism, were the reason for the disasters, that leaving Jodoshu and other heretical sects unattended would lead to a civil war in Japan and invasion by foreign countries and that the only way to provide the nation and the people with peace and security would be to establish the Lotus Sutra as the true religion.
この中で日蓮は災害の原因を人々が正法である法華経を信じずに浄土宗などの邪法（邪悪な教え）を信じているからであるとして対立宗派を非難し、法華経だけではなく鎮護国家の聖典とされた金光明最勝王経なども引用しながら、このまま浄土宗などを放置すれば国内では内乱、外国からは侵略を受けると唱え、逆に正法である法華経を中心とすれば（「立正」）、国家も国民も安泰となる（「安国」）と主張したのである。