The Sūtra of Infinite Meaning is the introduction to the Lotus Sūtra. It is stated in this sūtra that counting the years of preaching by the Buddha one by one beginning with the Flower Garland Sūtra at the seat of enlightenment under the Bodhi tree to this Sūtra of Infinite Meaning on Mt. Sacred Eagle, 40 years or so has passed. During those years, the Buddha preached the Flower Garland Sūtra, the Āgama sūtras, the Hōdō sūtras, and the Wisdom Sūtra. What were preached in them are teachings for the Three Vehicles (śrāvaka, Pratyekabuddha, and bodhisattvas) and Five Vehicles (Three Vehicles plus human beings and heavenly beings). The practices preached in these sūtras, according to the Sūtra of Infinite Meaning, requires many kalpa (aeons) of bodhisattva practice. The sūtra divides the Buddha’s preaching into two categories of zui-jii (preaching according to His own mind) and zui-tai (according to the mind of others—listeners), stating that the Buddha’s preaching during the 40 years or so is of zui-tai (preached according to the capacity of the people who listened to Him). Therefore, there is a difference in meaning between the preaching of the pre-Lotus period and that of the Lotus period even though He may have used the same language, says the Sūtra of Infinite Meaning. Accordingly, the Lotus Sūtra ensures one will attain immediate Buddhahood while other sūtras require many kalpa (aeons) of practice. Regarding rebirth in the Pure Land, too, there is a difference between the Lotus Sūtra and other sūtras.

Shō Hokke Daimoku-shō, Treastise on Chanting the Daimoku of the Lotus Sūtra, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 15-16