Have you ever suddenly found that one who seemed only a casual acquaintance was compatible—"one of us"? Do you remember how a whole new dimension began to shine in the relationship—more openness and deeper affection?
Certainly interests in common with others make for closer relationships. But we all have precious spiritual things in common; paramount is one Father-Mother God, who includes all in His impartial outpouring of love. To see and feel this in all our relationships would enable us to see "them" as belonging to "us"—with all the warmth and openness that accompany this discovery.
What is this "us" and "them" but a mental attitude that pigeonholes people and creates unnecessary divisions and mistrusts. Such thinking tends to make us feel odd or uncomfortable if, for example, "one of us" is asked a question about Christian Science by "one of them," and we are diffident about wanting any of "them" to know that we are Christian Scientists.