As in much of medieval Tendai thought and various schools of Kamakura Pure Land, Zen, and other traditions, no direct causal connection is drawn in Nichiren’s thought between good deeds or the cultivation of virtue and the realization of enlightenment. … Nichiren did not stress observance of the precepts as necessary to liberation: the merit of keeping precepts is already contained within the daimoku. Moreover, he claimed that one who chants the daimoku cannot be drawn by evil acts into the lower realms of transmigration. Nichiren also participated in the discourse of the “realization of Buddhahood by evil persons” (akunin jōbutsu), usually in teachings to his warrior followers:

Whether or not evil persons (akunin) of the last age attain Buddhahood does not depend on whether their sins are light or heavy but rests solely upon whether or not they have faith in this sūtra. You are a person of a warrior house, an evil man involved day and night in killing. Up until now you have not abandoned the household life [to become a monk], so by what means will you escape the three evil paths? You should consider this well. The heart of the Lotus Sūtra is that [all dharmas] in their present status are precisely the Wonderful [Dharma], without change of original status. Thus, without abandoning sinful karma, one attains the Buddha Way.

This does not mean that Nichiren’s teaching legitimates evildoing, or that his community lacked for moral guidelines. His letters and other writings show that, in making personal decisions or advising his followers, Nichiren drew on a variety of ethical sources. Prominent among these is Confucian social morality, with its emphasis on the virtues of benevolence, righteousness, good faith, loyalty, and filial piety. Other ethical sources for Nichiren were generic Buddhist morality, including the virtues of almsgiving, forbearance, and equanimity; and the emerging warrior ethos, with its emphasis on courage and personal honor. However, such values are not central to Nichiren’s formal doctrine, which does not explicitly articulate a set of ethical principles. Only faith in the Lotus Sūtra and the rebuking of “slander of the Dharma” are specifically enjoined as necessary to salvation.