The Lotus Sūtra preaches that living beings are endowed with three kinds of Buddha nature: shōin busshō, ryōin busshō as well as en’in busshō (virtuous deeds which enable one to develop “wisdom”). …

The Words and Phrases of the Lotus Sūtra, fascicle 10, preaches: “The shōin busshō is possessed by the Dharma-bodied Buddha, and it is innately possessed by all the people throughout the past, present and future lives. By nature they are endowed also with seeds of the en’in and ryōin busshō; these Buddha-natures are not acquired as a result of practicing Buddhism.”

Hasshū Imoku-shō, A Treatise on the Differences of the Lotus Sect from Eight Other Sects, Writings of Nichiren Shōnin, Doctrine 2, Page 16-17