‘Mission’, ‘evangelism’, ‘dialogue’, ‘salvation’, and ‘conversion’—as Christians, we hear these words often, but over time their meanings can become muddled and distorted. How can we return to a biblical definition of these terms? John Stott’s fresh biblical perspective, given at the 1974 International Congress on World Evangelization, reminds us that the best way to renew our gospel zeal is to return to the source.