Polemics is medicine, not food. Without medicine we will surely die—we can’t live without it. This is why “polemical theology’ must be a required part of every theological curriculum. Yet we cannot live on medicine. If you engage in polemics with relish and joy—if polemics takes up a significant percentage or even a majority of your time and energy—it is like trying to live on medicine alone. It won’t work, for the church or for you.
Tim Keller, "Gospel Polemics, Part 1" - read more