How to Love One Another: Affirm, Share and Serve (Tim Keller) "Most of us are familiar with the “one another” commands of the New Testament. In the study guide for Gospel in Life: Grace Changes Everything, Tim Keller offers a helpful taxonomy under the categories of affirming one another, sharing with one another, and serving one another. These form, he says, “nine ‘community-building practices’—specific behaviors that build Christian community.” For a more detailed unpacking of each point, see pp. 58-71..."