The Daishonin writes, “If Nichiren’s compassion is truly great and encompassing, Nam-myoho-renge-kyo will spread for ten thousand years and more, for all eternity” (WND-1, 736). He is indicating that the flow of kosen-rufu—of widespread propagation—goes on endlessly, never ceasing. Kosen-rufu is not the end point of the flow; it is the flow itself, the vibrant coursing of this living Buddhism throughout society and the world. From The Wisdom for Creating Happiness and Peace, part 3, revised edition, p. 15

Daisaku Ikeda

The inner source of eternal, indestructible, absolute happiness is Nam-myoho-renge-kyo, which shines in the depths of your being. True happiness lies in tapping this source as you strive to cultivate your own life, which is still a work in progress. This is the essence of Buddhism.
>From The Wisdom for Creating Happiness and Peace, part 2, revised edition, p. 351

Daisaku Ikeda

Who, then, is the correct teacher we should seek? It is the person who chants and spreads the Mystic Law with selfless dedication while battling the three powerful enemies of Buddhism. Correct teachers of the Law can be identified by whether they have encountered hardships and opposition just like those described in the Lotus Sutra.
>From The Wisdom for Creating Happiness and Peace, part 3, revised edition, p. 230

Daisaku Ikeda