Once I had a friend — I’ll call him Bill — who worked out everyday at the gym. When we got together, he liked to flex his bicep and say, “Greg, feel this!” Bill’s muscles were rock hard. Then one day I heard terrible news. Bill had died of a heart attack. Even though he appeared robust and powerful, his heart was diseased. Inwardly, as it turned out, Bill was a weakling. I keep Bill in mind when I think about the church today. Outwardly everything can look promising. A ministry may appear to be going very well. Yet the...