Book excerpt: John Armstrong knows from personal experience how easy it is to put too much emphasis on correct teaching in our experience of church—and how easily we lose sight of the love on which Christ built his church when we do so. In Costly Love, Armstrong acknowledges the importance of doctrine and theological discussion in the church, but he urges Christians to focus first on whether we are following Jesus’ new commandment: to love as he loved. Our actions of love will begin to bring us closer to unity with one another and with God.