Evangelism—sharing the good news about Jesus as the Saviour of sinners—is both the privilege and duty of every believer. Jesus calls Christians to be lights in the world, to make a difference like salt that purifies and preserves. To neglect evangelism is to live in contradiction to our faith. Calvin writes, “And indeed nothing could be more inconsistent with the nature of faith than that deadness which would lead a man to disregard his brethren, and to keep the light of knowledge choked up...