In ancient China a man called Hung-yen, a retainer of the Duke of Yee of Wei state, cut open his own stomach and inserted his slain lord’s liver inside him before he died. Similarly, a man called Yü-jang tried to repay his indebtedness to his Lord Chih-pai by swallowing a sword and killing himself. These were cases in the secular world of repaying a minor debt of kindness, to what lengths should one go to repay the debt to the Buddha?

The reason why we continue to transmigrate through the six lower realms without attaining Buddhahood from the eternal past of innumerable kalpa (aeons) till today is that we fail to give up our lives for the sake of the Lotus Sūtra. Gladly Seen Bodhisattva burned himself for 1,200 years as a votive light to the Sun Moon Pure Bright Virtue Buddha and burned his arms for 72,000 years to the Lotus Sūtra. He is Medicine King Bodhisattva today. Never Despising Bodhisattva was abused, disparaged, beaten with sticks and rubble was thrown at him for many kalpa (aeons) in order to disseminate the teaching of the Lotus Sūtra. Did he not become Śākyamuni Buddha in a future existence? Therefore, the way of practicing the sūtra leading to Buddhahood differs according to the times.

Inchinosawa Nyūdō Gosho, A Letter to Lay Priest Ichinosawa, Writings of Nichiren Shōnin, Volume 6, Followers I, Pages 164-165