"Jesus puts it simply: "Whoever is not with me is against me, and whoever does not gather with me scatters" (Matt. 12:30). The gospel is such power that it necessitates reaction. Jesus Christ has worked such an outrageous wonder that he demands response, whether hatred or passion. Anyone ambivalent about what Christ has actually done just isn't clear on the facts. To present the gospel, then, is to place a hearer in an untenable position. The heart of the hearer of the gospel must move, either toward Christ or away from him."
(Chandler, Matt, and Jared C. Wilson. The Explicit Gospel. Wheaton, IL: Crossway, 2012. Print. 63)