The dinner where we hosted families from five nations remains a wonderful memory. Somehow the conversation didn’t splinter into twos, but we all contributed to a discussion of life in London from the viewpoints of different parts of the world. At the end of the evening, my husband and I reflected that we had received more than we gave, including the warm feelings we experienced in fostering new friendships and learning about different cultures.

The writer of the book of Hebrews concluded his thoughts with some exhortations for community life, including that his readers should continue to welcome strangers. For in…