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. So it is with habits: the older they are the stronger they grow
Habit is the nurse of sin. Every fresh act of sin lessens fear and remorse, hardens our hearts, blunts the edge of our conscience, and increases our evil inclination.
– J.C. Ryle (Fathers & Sons: Stand Fast In the Way of Truth, p. 40).