Belief is not subject to the will. Men think as they must. Children do not, and cannot, believe exactly as they were taught. They are not exactly like their parents. They differ in temperament, in experience, in capacity, in surroundings. And so there is a continual, though almost imperceptible change. There is development, conscious and unconscious growth, and by comparing long periods of time we find that the old has been almost abandoned, almost lost in the new.