Unhealthy churches cause few problems for the healthiest Christians; but they are cruel taxes on the growth of the youngest and weakest Christians. They prey on those who don’t understand Scripture well. They mislead spiritual children. They even take the curious hopes of non-Christians that there might be another way to live, and seem to deny it. Bad churches are terribly effective anti-missionary forces.
– Nine Marks of a Healthy Church, p. 13.