Grand Master T’ien-t’ai states in his Profound Meaning of the Lotus Sūtra fascicle 6, “It is said in a secular society that a cobweb is an advance notice of a happy event and chirps of a magpie foretell the arrival of a traveler. Even such trifle matters in the secular world are foreshadowed by an omen, how much more so the advent of the Buddhist Dharma. Based on worldly matters, we can conjecture the profound truth of Buddhism.” Thus, the Buddha showcased the greatest omens that had never been seen during the more than 40 years in His lifetime when He expounded the theoretical section of the Lotus Sūtra.
Zuisō Gosho, Writing on Omens, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 122