In such sūtras as the Amitābha Sūtra — preached during the 40 years or so before the Lotus Sūtra — the Buddha said to Śāriputra, “When one chants the name of Amitābha Buddha a million times in seven days one will inevitably be reborn in the Pure Land of Utmost Bliss.” However, upon expounding the Lotus Sūtra later, the Buddha declared, “No truth has been revealed in those pre-Lotus sūtras.” Therefore, all the scriptures of Buddhism preached before the Lotus Sūtra became meaningless, like hot water boiled for seven days but then thrown into the ocean.

Sennichi-ama Gohenji, A Reply to Sennichi-ama, Writings of Nichiren Shōnin, Volume 7, Followers II, Pages 160