When Śākyamuni Buddha was the Wheel-turning Noble King in his previous life, he treasured this eight-character verse: “One who is born is destined to die. Extinguishing the attachment to life calms the mind.” He offered 1,000 lights to the verse by pouring oil on his body and burning it. Moreover, having the verse written on rocks, walls, and the main roads, he inspired those who read it to aspire for enlightenment. The rays of these 1,000 lights reached the Trāyastriṃsá Heaven, illuminating Indra, the lord of the heavens as well as other heavenly beings.

Nichimyō Shōnin Gosho, A Letter to Nichimyō Shōnin, Writings of Nichiren Shōnin, Followers II, Volume 7, Page 137