Nichiren on how the rulers can save their countries

"Then the Buddha said: Listen carefully. You must not propagate it in the first millennium of the Former Day of the Law or in the second millennium of the Middle Day following my death. In the beginning of the Latter Day of the Law, slanderous monks will fill the land of Jambudvīpa, so that all the heavenly gods will demonstrate their rage, comets will appear in the sky, and the earth will quake like the movement of huge waves. Innumerable disasters and calamities, such as drought, fires, floods, gales, epidemics, famine, and war, will all occur at once. The people of Jambudvīpa will don armor and take up bows and staves, but since none of the Buddhas, bodhisattvas, or benevolent deities will be able to help them, they will all die and fall like rain into the hell of incessant suffering. At this very time, rulers can save their countries and the people be freed from calamities and in their next life escape the great fires of hell if they embrace and believe in this great mandala of the five characters.'”