When Śākyamuni Buddha denied his earlier teachings and revealed the truth, He stated positively, “The World Honored One expounds the true teaching after a long period [of expounding expedient teachings]; and I have been reticent on this truth [that is, the reality of all things,] for a long time.” The Buddha of Many Treasures then sprang up from the underground and declared that it was the truth, and the Buddhas of the ten directions gathered together and approved the truth by reaching their broad, long tongues to the palace of the Great King of the Brahma Heaven. All the audience at the three meetings at two places where the Buddha expounded the Lotus Sūtra witnessed them.

Nanjō Hyōe Shichirō-dono Gosho, A Letter to Lord Nanjō Hyōe Shichirō, Writings of Nichiren Shōnin, Doctrine 3, Pages 139.