Sometimes advancing together with others is frustrating and difficult. Acting alone, just as one pleases, is undoubtedly much easier. But that can lead to becoming self-centered, which prevents us from practicing Buddhism properly. Before we know it, we’ll have strayed from the correct path. Ultimately, we’ll find ourselves in a lonely, sad, and miserable state of life. Mutual development and true Buddhist practice lie in joining together with many different kinds of individuals and sharing various challenges and efforts with them as we encourage one another to advance and grow.
From The Wisdom for Creating Happiness and Peace, part 3, revised edition, pp. 106-107

Daisaku Ikeda

The way to happiness is not complicated. Those who chant Nam-myoho-renge-kyo consistently in the realm of kosen-rufu triumph in the end. They are certain to attain a state of absolute happiness—in other words, the life state of Buddhahood. If you remember this single important point, your life will always be solid and secure.
From The Wisdom for Creating Happiness and Peace, part 2, revised edition, pp. 50-51

Daisaku Ikeda

His[Nichiren’s] message is that, though we all differ in our appearance and individual circumstances, each of us who embraces the Gohonzon, chants Nam-myoho-renge-kyo, and works for kosen-rufu can—just as we are, in our present form— shine like the majestic treasure tower of life adorned with the seven kinds of treasures. From The Wisdom for Creating Happiness and Peace, part 3, revised edition, p. 78

Daisaku Ikeda