The “lion’s roar” of Nam-myoho-renge-kyo is the ultimate weapon for battling illness. We must absolutely never forget the Daishonin’s words “Nam-myoho-renge-kyo is like the roar of a lion. What sickness can therefore be an obstacle?” (WND-1, 412).

From The Wisdom for Creating Happiness and Peace, part 1, revised edition, p. 259