From these two observations together, that practical habits are formed and strengthened by repeated acts, and that passive impressions grow weaker by being repeated upon us, it must follow, that active habits may be gradually forming and strengthening, by a course of acting upon such and such motives and excitements, while these motives and excitements themselves are, by proportionable degrees, growing less sensible; _i.e._ are continually less and less sensibly felt, even as the active habits strengthen. And experience confirms this: for active principles, at the very time that they are less lively in perception than they were, are found to be, somehow, wrought more thoroughly into the temper and character, and become more effectual in influencing our practice. The three things just mentioned may afford instances of it. Perception of danger is a natural excitement of passive fear, and active caution: and by being inured to danger, habits of the latter are gradually wrought, at the same time that the former gradually lessens. Perception of distress in others is a natural excitement, passively to pity, and actively to relieve it: but let a man set himself to attend to, inquire out, and relieve distressed persons, and he cannot but grow less and less sensibly affected with the various miseries of life, with which he must become acquainted; when yet, at the same time, benevolence, considered not as a passion, but as a practical principle of action, will strengthen: and while he passively compassionates the distressed less, he will acquire a greater aptitude actively to assist and befriend them. So also at the same time that the daily instances of men’s dying around us give us daily a less sensible passive feeling or apprehension of our own mortality, such instances greatly contribute to the strengthening a practical regard to it in serious men; _i.e._ to forming a habit of acting with a constant view to it.