Among all the Buddhist scriptures preached by the Buddha there is no sūtra which does not mention the trembling of the earth in six different ways. However, the shaking of the earth in six ways when the Buddha was about to expound the Lotus Sūtra was so striking that the living beings who gathered to listen to Him were all startled and it moved Bodhisattva Maitreya to ask what was happening, prompting Bodhisattva Mañjuśrī to answer. This shows that the omen for the preaching of the Lotus Sūtra was much greater and longer than the omens of other sūtras that the question concerning it was more difficult to respond to. Therefore, Grand Master Miao-lê states in his Annotations on the Words and Phrases of the Lotus Sūtra, fascicle 2, “Which Mahāyāna sūtra does not have the omens such as a crowd of living beings gathered together like a cloud, emitting of light from the forehead of the Buddha, the rain of flowers from the heaven, and trembling of the earth? However, they have never caused such a great concern as this.” This means that every sūtra has a preface before preaching the main discourse, but no preface is accompanied by such great omens like those that accompanied the preface of the Lotus Sūtra.

Zuisō Gosho, Writing on Omens, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 122