Moreover, I chant the daimoku, which is the heart and core of the entire sutra, and I urge others to do likewise. Although the mugwort growing in a hemp field or wood marked for cutting with an inked line may not be straight to begin with, they will as a matter of course become so. In the same way, one who chants the daimoku as the Lotus Sutra teaches will never have a twisted mind. For one should know that, unless the mind of the Buddha enters into our bodies, we cannot in fact chant the daimoku.
The Writings of Nichiren Daishonin, page 670
The Blessings of the Lotus Sutra
Written to Myomitsu on March 5, 1276
It is the sharp sword of the Mystic Law and the great power of faith that enable us to completely sever the chains of suffering. Therefore, I wish to make it clear that to secure eternal freedom and happiness, you must absolutely not be cowardly, especially in faith.