Wherever practitioners of the Lotus Sutra chant Nam-myoho-renge-kyo, just as an echo answers a sound and a shadow follows a form, their prayers will unfailingly produce positive results there. The Daishonin teaches that our lives are transformed—both spiritually and physically—by prayer, which in turn exerts a positive influence on our environment.

From The Wisdom for Creating Happiness and Peace, part 1, revised edition, p. 118