MACAULAY ON DEMOCRATIC GOVERNMENT
On Self-Interest
What proposition is there respecting human nature which is absolutely and universally true? We know of only one: and that is not only true, but identical; that men always act from self-interest. This truism the Utilitarians proclaim with as much pride as if it were new, and as much zeal as if it were important. But in fact, when explained, it means only that men, if they can, will do as they choose. When we see the actions of a man, we know with certainty what he thinks his interest to be. But it is impossible to reason with certainty from what we take to be his interest to his actions. One man goes without a dinner that he may add a shilling to a hundred thousand pounds; another runs in debt to give balls and masquerades. One man cuts his father's throat to get possession of his old clothes: another hazards his own life to save that of an enemy. One man volunteers on a forlorn hope: another is drummed out of a regiment for cowardice. Each of these men has, no doubt, acted from self-interest. But we gain nothing by knowing this, except the pleasure, if it be one, of multiplying useless words. In fact, this principle is just as recondite and just as important as the great truth that whatever is, is. If a philosopher were always to state facts in the following form -- "There is a shower; but whatever is, is; therefore, there is a shower," -- his reasoning would be perfecty sound: but we do not apprehend that it would materially enlarge the circle of human knowledge. And it is equally idle to attribute any importance to a proposition which, when interpreted, means only that a man had rather do what he had rather do.

If the doctrine, that men always act from self-interest, be laid down in any other sense than this -- if the meaning of the word self-interest be narrowed so as to exclude any one of the motives which may by possibility act on any human being, -- the proposition ceases to be identical; but at the same time it ceases to be true.

What we have said of the word "self-interest" applies to all the synonymes and circumlocutions which are employed to convey the same meaning; pain and pleasure, happiness and misery, objects of desire, and so forth.

Men will take the objects of their desire if they can. Unquestionably: -- but this is an identical proposition; for an object of desire means merely a thing which a man will procure if he can. Nothing can possibly be inferred from a maxim of this kind. When we see a man take something we shall know that it was an object of his desire. But till then we have no means of judging with certainty what he desires or what he will take.

--from "Mill's Essay on Government"    

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