Staleness is the first sign of decay. Avoiding getting stuck in a rut is key to any training schedule. All training regimes get old unless changes are made. The body plateaus and needs a new stimulus or it won’t improve. All exercise routines need variety. No matter how hard we work, we need change.
Spiritually we also need to be challenged, or we go stale. There is nothing spiritual about sitting in the same pew for 30 years. Recently I asked a man who ran a retreat center if he had seen any other retreat centers lately? He replied with an air of conceit that he had been too busy ministering and had not seen any other center in 10 years. His center had that sad stale smell.