“Once sin is allowed to settle in your heart, it will not be turned out at your bidding. Custom becomes second nature, and its chains are not easily broken. The prophet has well said, "Can the Ethiopian change his skin, or the leopard its spots? Neither can you do good who are accustomed to doing evil" (Jeremiah 13:23). Habits are like stones rolling down hill--the further they roll, the faster and more ungovernable is their course. Habits, like trees, are strengthened by age. A boy may bend an oak when it is a sapling--a hundred men cannot root it up, when it is a full grown tree. A child can wade over the Thames River at its fountain-head--the largest ship in the world can float in it when it gets near the sea. So it is with habits: the older the stronger--the longer they have held possession, the harder they will be to cast out.”