It is therefore impossible to know the meanings of various sūtras of Śākyamuni Buddha preached during His lifetime no matter how many times we read them without the Lotus Sūtra. Without knowing this, a practicer of the Lotus Sūtra who reads the Lotus Sūtra does not really read it. It is a mistake to insist that the pre-Lotus sūtras of the profound teaching do not reveal the meaning of those on the shallow teaching, and that the sūtras of the shallow teaching do not contain the profound teaching. The Lotus Sūtra reveals in every word the meanings of all the pre-Lotus sūtras as well as the Lotus Sūtra. Therefore, reading a word of the Lotus Sūtra is equivalent to reading all of the Buddhist scriptures. Not to read the Lotus Sūtra at all means not to read the scriptures of Buddhism. Attaining Buddhahood, therefore, is difficult in the land where there is not the Lotus Sūtra but various other sūtras. The way to read all Buddhist scriptures after the Buddha’s death such as the Flower Garland Sūtra or the Sūtra of Meditation on the Buddha of Infinite Life, then, should be to read them together with the Lotus Sūtra that reveals the meaning of each sūtra. All other sūtras should be read in the same manner.

Nijō Sabutsu Ji, Obtaining Buddhahood by the Two Vehicles, Writings of Nichiren Shōnin, Doctrine 3, Page 229