II. Next to the power of attention, we have to notice the influence produced upon the affections by Habit. This is founded upon a principle of our nature, by which a remarkable relation exists between the affections and the actions which arise out of them. The tendency of all emotions is to become weaker by repetition, or to be less acutely felt the oftener they are experienced. The tendency of actions, again, as we have seen when treating of the Intellectual Powers, is to become easier by repetition,--so that those, which at first require close and continued attention, come to be performed without effort, and almost without consciousness. Now an affection properly consists of an emotion leading to an action; and the natural progress of the mind, in the proper exercise of the affection, is, that the emotion becomes less acutely felt, as the action becomes easier and more familiar.--Thus, a scene of wretchedness, or a tale of sorrow, will produce in the inexperienced an intensity of emotion not felt by him whose life has been devoted to deeds of mercy; and a superficial observer is apt to consider the condition of the latter as one of insensibility, produced by familiarity with scenes of distress. It is, on the contrary, that healthy and natural progress of the mind, in which the emotion is gradually diminished in force as it is followed by its proper actions,--that is, as the mere intensity of feeling is exchanged for the habit of active benevolence. But that this may take place in the sound and healthy manner, the emotion must be steadily followed by the action which belongs to it. If this be neglected, the harmony of the moral process is destroyed, and, as the emotion becomes weakened, it is succeeded by cold insensibility or barren selfishness.