In order to see our own faces we have to look at them reflected upon a spotless mirror. Likewise, in order to see the rise and fall of a country, there is no way better than to see them reflected upon the mirror of the Buddhist dharma. As we respectfully read such Mahāyāna sūtras as the Sūtra of the Benevolent King, Sūtra of the Golden Splendor, Guardian Sūtra, Nirvana Sūtra, and Lotus Sūtra, it is preached that the rise and fall of a country and the life span of people in it depend on the Dharma they believe, whether they believe in the True Dharma or a false dharma. It is like water that keeps a boat afloat but also destroys it, or staple grains which nourish human bodies but often damage them. Small winds and waves would not damage large ships, but small ships can easily be destroyed by gale winds and huge waves. Unjust government, like small winds and waves, would not cause the downfall of a great country and a great man; however, there is no doubt that a false dharma in Buddhism, like gale winds and huge waves destroying small boats, will destroy a country.

Shinkoku-ō Gosho, Sovereigns of Our Divine Land, Writings of Nichiren Shōnin, Doctrine 1, Page 176