[A] Buddha … has 32 marks of physical excellence such as a “Brahma’s voice,” the top of His head which no one can see, a bump on top of His head, a curl of white hair that is always shining in the middle of His forehead, and dharma-cakra on the soles of His feet. It is said that in order to gain one of these 32 marks, one has to accumulate the merit of 100 “meritorious acts.” Suppose there is a great physician who can simultaneously open the eyes of all the blind in Japan, China, and the 16 great countries, 500 middle-sized countries, and 10,000 small countries that make up India, as well as the continent of Jambudvīpa, the four continents surrounding Mt. Sumeru, the six heavens in the realm of desire, and all the worlds in the universe. His work certainly falls in the category of “meritorious acts,” but only when he repeats the “meritorious acts” such as this 100 times can [he] receive one of the 32 marks of physical excellence. Accordingly, the merits of having one of these 32 marks is more numerous than the vegetation in the triple-thousand worlds or the number of raindrops in the entire world. It is said that during the kalpa of destruction a terrible wind known as sogyada would blow Mt. Sumeru up to the top of the realm of form smashing it to small pieces. Even such a fierce wind as this cannot move a single hair of a Buddha. It is also said that the Buddha has a great fire stored in His chest. It is called “Great Wisdom of Equality, Light of Great Knowledge, Fire Pit Meditation,” and He sometimes cremates Himself upon entering Nirvana in this fire. If heavenly beings and dragon gods in the six heavens of the realm of desire and oceans in the four directions gather together, and out of sorrow for the passing of the Buddha, they try to extinguish this great fire by causing such a great rain that all the lands in the whole universe are flooded and Mt. Sumeru begins to flow, it is said, they cannot extinguish this great fire of the Buddha.

Hōren-shō, Letter to Hōren, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 47