Nam-myoho-renge-kyo is like the roar of a lion, Nichiren says (MW-1, 119). It is by chanting powerful daimoku, like a lion’s roar, that we can move the Buddhist deities, the protective forces of the universe. The voice is very important—it has profound power. While naturally being careful not to disturb your neighbors, I hope you will endeavor to chant cheerful and powerful daimoku that reaches all the Buddhist deities and Buddhas throughout the ten directions.
from sgi.org