The telephone rings, you answer, it's someone from the church. After a bit of polite chit-chat, the caller gets to the point: "The reason I'm calling," she confesses, "is that we would really like it if you would consider teaching Sunday School next year, or serving as a Presbyterian Women's Ministry leader, singing in the choir, chairing a particular committee, whatever." And you think: "Dear God, they must really be scraping the bottom of the barrel," or "I already have so much to do," and all of the good, logical reasons for not saying "yes" come immed…