If the apostle Paul had not punctuated his words with images of the armor of God or the racecourse, would we so easily remember his instruction? The march on Washington might have become nothing more than a ragged hike across a majestic mall if Martin Luther King, Jr. had not led us through a "dream" and onto a "mountaintop." Such is the power of illustrations. They contain a hidden dynamic of living that captures our attention and furthers...