In one region of Africa, the first converts to Christianity were very diligent about praying. In fact, the believers each had their own special place outside the village where they went to pray in solitude. The villagers reached these “prayer rooms” by using their own private footpaths through the brush. When grass began to grow over one of these trails, it was evident that the person to whom it belonged was not praying very much.
Because these new Christians were concerned for each others spiritual welfare, a unique custom sprang up. When ever anyone noticed an overgrown “Prayer path,” he or she would go to the person and lovingly warn, “Friend, theres grass on your path!” - RWD