Self-interest, or rather self-love, or egoism, has been more plausibly substituted as the basis of morality. But I consider our relations with others as constituting the boundaries of morality. With ourselves we stand on the ground of identity, not of relation, which last, requiring two subjects, excludes self-love confined to a single one. To ourselves, in strict language, we can owe no duties, obligation requiring also two parties. Self-love, therefore, is no part of morality. Indeed it is exactly its counterpart. It is the sole antagonist of virtue, leading us constantly by our propensities to self-gratification in violation of our moral duties to others. Accordingly, it is against this enemy that are erected the batteries of moralists and religionists, as the only obstacle to the practice of morality. Take from man his selfish propensities, and he can have nothing to seduce him from the practice of virtue. Or subdue those propensities by education, instruction or restraint, and virtue remains without a competitor.
Egoism, in a broader sense, has been thus presented as the source of moral action. It has been said that we feed the hungry, clothe the naked, bind up the wounds of the man beaten by thieves, pour oil and wine into them, set him on our own beast and bring him to the inn, because we receive ourselves pleasure from these acts... This indeed is true. But it is one step short of the ultimate question. These good acts give us pleasure, but how happens it that they give us pleasure? Because nature hath implanted in our breasts a love of others, a sense of duty to them, a moral instinct, in short, which prompts us irresistibly to feel and to succor their distresses, and protests against the language of Helvetius, [ib. 2, 5,] "what other motive than self-interest could determine a man to generous actions? It is as impossible for him to love what is good for the sake of good, as to love evil for the sake of evil."
The Creator would indeed have been a bungling artist, had he intended man for a social animal, without planting in him social dispositions. It is true they are not planted in every man, because there is no rule without exceptions; but it is false reasoning which converts exceptions into the general rule. Some men are born without the organs of sight, or of hearing, or without hands. Yet it would be wrong to say that man is born without these faculties, and sight, hearing, and hands may with truth enter into the general definition of man. The want or imperfection of the moral sense in some men, like the want or imperfection of the senses of sight and hearing in others, is no proof that it is a general characteristic of the species. When it is wanting, we endeavor to supply the defect by education, by appeals to reason and calculation, by presenting to the being so unhappily conformed, other motives to do good and to eschew evil, such as the love, or the hatred, or rejection of those among whom he lives, and whose society is necessary to his happiness and even existence; demonstrations by sound calculation that honesty promotes interest in the long run; the rewards and penalties established by the laws; and ultimately the prospects of a future state of retribution for the evil as well as the good done while here.
These are the correctives which are supplied by education, and which exercise the functions of the moralist, the preacher, and legislator; and they lead into a course of correct action all those whose disparity is not too profound to be eradicated. Some have argued against the existence of a moral sense, by saying that if nature had given us such a sense, impelling us to virtuous actions, and warning us against those which are vicious, then nature would also have designated, by some particular ear-marks, the two sets of actions which are, in themselves, the one virtuous and the other vicious. Whereas, we find, in fact, that the same actions are deemed virtuous in one country and vicious in another. The answer is that nature has constituted utility to man the standard and best of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful, and consequently virtuous in one country which is injurious and vicious in another differently circumstanced. sincerely, then, believe with you in the general existence of a moral instinct. I think it the brightest gem with which the human character is studded, and the want of it as more degrading than the most hideous of the bodily deformities.