When all the people under the heaven and various schools of Buddhism are all converted to the one and real vehicle, and when only the Lotus Sutra flourishes and all the people recite “Namu Myoho Renge-kyo” in unison, the howling wind will not blow on the branches, falling rain will not erode the soil, and the world will become as good as during the reigns of the Chinese Emperors Fu-hsi and Shen-neng. You will see that such times will come when the calamities cease to exist, people live long, and men and their faith become eternal. There should be no doubt about the proof of the tranquility in life.
An Instruction from Sado to Disciples and Followers, Shingyō Hikkei: Nyosetsu Shugyō-shō