Some of my disciples pretend to know the details of doctrines. They are mistaken. The odaimoku, Namu Myōhō Renge Kyō, is the essence of the Lotus Sūtra. It is like a human being’s spirit. If any other teachings were to be added to the odaimoku, it would be the cause of great trouble. It would be like the Empress marrying two Emperors, or committing adultery. The teachings of the Lotus Sūtra did not spread far enough during the Ages of the True Dharma and the Semblance Dharma. This was because these periods were intended for other sūtras.

We are presently living in the Latter Age of Degeneration. The Lotus Sūtra and other sūtras are no longer efficacious in bringing about enlightenment. Only the odaimoku can accomplish this. This is not my arbitrary opinion. It was so-arranged by the Buddha, the Buddha of Many Treasures, various Buddhas from all over the universe, and numerous great bodhisattvas from beneath the earth such as Superior Practice Bodhisattva.

It is a serious mistake to mix other teachings with the odaimoku. For example, when the sun rises, we no longer need to use lamps. When it rains, the dew is of no use. A baby does not need any nourishment except for milk. We do not need to add supplements to effective medicine.

Ueno-dono Gohenji, A Reply to Lord Ueno, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 119

In these first 38 days, I’ve have repeatedly expressed what could be construed as doubts about relying solely on the odaimoku – Day 30, Day 24 and Day 18. Clearly this letter nixes that discussion.