Paul's challenge to Timothy 2,000 years ago remains a clarion call for pastors today: "Do the work of an evangelist, fulfill your ministry" (2 Tim 4:5). Because evangelism is the central work of a Christian's life, there is a great need for pastors to understand what evangelism is and what makes it effective. Much of modern evangelical culture has become memorized conversations, pre-packaged formulas, and programmatic approaches...