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