“Many in body, one in mind” is not something as superficial as just getting along well together. The “mind” in question is the mind or spirit to believe wholeheartedly in the Gohonzon, to never stray from the example of Nichiren Daishonin’s life, and to forge ahead tirelessly with our fellow practitioners to the very end. This unwavering faith is the “mind” of “many in body, one in mind.”

From The Wisdom for Creating Happiness and Peace, part 3, revised edition, pp 163-164