Prayer produces a change within our hearts, within the depths of our lives. This profound, intangible inner change does not end with us alone [but inspires a similar change in others]. Likewise, when one community changes, it will not be limited to that community alone. Just as a single wave gives rise to countless others, change in one community will create a ripple effect of change in other communities as well.

From The Wisdom for Creating Happiness and Peace, part 1, revised edition, p. 119