We, sentient beings in this Sahā World, have all been beloved children of the Lord Buddha Śākyamuni since “500 dust-particle kalpa” ago. Because of our own fault, being undutiful to the Buddha, we had not been aware of being His children until today, but we are not the same as sentient beings in other worlds. The relationship between the Buddha and us, which was established in the remotest past of 500 dust particle kalpa ago, is like the moon in the sky reflecting on clear water by itself. Our relationship to other Buddhas, which has never been established, is like deaf people unable to hear the peal of thunder or blind people unable to see the sun and moon.

Hokke Shuyō Shō, Treatise on the Essence of the Lotus Sūtra, Writings of Nichiren Shōnin, Doctrine 2, Page 209