'In Christendom, you could afford to train people solely in prayer, Bible study, and evangelism - skills for their private lives - because they were not facing radically non-Christian values in their public lives. In a missional church, all people need theological education to "think Christianly" about everything and to act with Christian distinctiveness. They need to know which cultural practices reflect common grace and should be embraced, which are antithetical to the gospel and must be rejected and which practices can be adapted or revised.'
Timothy Keller, Center Church, p.260.
