Nichiren Daishonin wrote this letter at Minobu to Nanjō Tokimitsu, the steward of Ueno Village in Suruga Province, in the second month of the fourth year of Kenji (1278). The previous year had been a time of turmoil. A serious drought had devastated crops, and the resulting famine brought countless hardships. In addition, an epidemic had swept the area, causing many deaths. At the same time, the threat of a second invasion by Mongol forces contributed to a general feeling of unease. In this letter, Nichiren Daishonin expresses his gratitude for Nanjō’s offerings and praises him for his deep sincerity. He introduces the concept of the two kinds of faith: faith like ephemeral fire and faith like ever-flowing water. The Daishonin lauds Nanjō’s faith as being like the latter. https://www.nichirenlibrary.org/en/wnd-1/Content/113