THE British anthropologist and Oxford professor Robin Dunbar has posed a theory that the number of individuals with whom a stable interpersonal relationship can be maintained (read: friends) is limited by the size of the human brain, specifically the neocortex. “Dunbar’s number,” as this hypothesis has become known, is 150.

Perhaps this is why the Alban Institute set the number of worship attenders at 50 – 150 for a pastor size congregation. A pastor can only maintain so many relationships. I rarely see a pastor sized congregation grow beyond 200 in worship, and that takes a uniquely gifted pastor.