Bounded Set vs. Centered Set
This is one of the very best explanations of the social set theory referred to as Bounded Set and Centered Set. Deb Hirsch graciously applies the concept to the way we typically understand the church and helps us rethink a more missionary way to consider discipleship. If you are not familiar with Deb check out her excellent book Redeeming Sex: Naked Conversation about Sexuality and Spirituality.