"The treacherous enemy facing the church of Jesus Christ today is the dictatorship of the routine, when the routine becomes "lord" in the life of the church. Programs are organized and the prevailing conditions are accepted as normal. Anyone can predict next Sunday's service and what will happen. This seems to be the most deadly threat in the church today. When we come to the place where everything can be predicted and nobody expects anything unusual from God, we are in a rut. The routine dictates, and we can tell not only what will happen next Sunday, but what will occur next month and, if things do not improve, what will take place next year. Then we have reached the place where what has been determines what is, and what is determines what will be.
That would be perfectly all right and proper for a cemetery. Nobody expects a cemetery to do anything but conform.... But the church is not a cemetery and we should expect much from it, because what has been should not be lord to tell us what is, and what is should not be ruler to tell us what will be. God's people are supposed to grow."
Tozer on Christian Leadership: A 366-Day Devotional.