All teachings are contained within the daimoku (Myoho renge kyo)

Nichiren Writes:

“Question: Why do you say that all teachings are contained within the daimoku?

Answer: Chang-an writes as follows: “Hence [T’ien-t’ai’s explanation of the title in] the preface conveys the profound meaning of the sutra. The profound meaning indicates the heart of the text, and the heart of the text encompasses the whole of the theoretical and the essential teachings.” And Miao-lo writes: “On the basis of the heart of the text of the Lotus Sutra, one can evaluate all the other various teachings of the Buddha.”

Though muddy water has no mind, it can catch the moon’s reflection and so naturally become clear. When plants and trees receive the rainfall, they can hardly be aware of what they are doing, and yet do they not proceed to put forth blossoms? The five characters of Myoho-renge-kyo do not represent the sutra text, nor are they its meaning. They are nothing other than the intent of the entire sutra. So, even though the beginner in religious practice may not understand their significance, by practicing these five characters, he will naturally conform to the sutra’s intent.” Major Writings of Nichiren Daishonin, Vol. 6, page 211.