There is, however, one virtue of which the general rules determine with the greatest exactness every external action which it requires. This virtue is justice. The rules of justice are accurate in the highest degree, and admit of no exceptions or modifications, but such as may be ascertained as accurately as the rules themselves, and which generally, indeed, flow from the very same principles with them. If I owe a man ten pounds, justice requires that I should precisely pay him ten pounds, either at the time agreed upon, or when he demands it. What I ought to perform, how much I ought to perform, when and where I ought to perform it, the whole nature and circumstances of the action prescribed, are all of them precisely fixed and determined. Though it may be awkward and pedantic, therefore, to affect too strict an adherence to the common rules of prudence or generosity, there is no pedantry in sticking fast by the rules of justice. On the contrary, the most sacred regard is due to them; and the actions which this virtue requires are never so properly performed, as when the chief motive for performing them is a reverential and religious regard to those general rules which require them. In the practice of the other virtues, our conduct should rather be directed by a certain idea of propriety, by a certain taste for a particular tenor of conduct, than by any regard to a precise maxim or rule; and we should consider the end and foundation of the rule, more than the rule itself. But it is otherwise with regard to justice: the man who in that refines the least, and adheres with the most obstinate steadfastness to the general rules themselves, is the most commendable, and the most to be depended upon. Though the end of the rules of justice be, to hinder us from hurting our neighbour, it may frequently be a crime to violate them, though we could pretend with some pretext of reason, that this particular violation could do no hurt. A man often becomes a villain the moment he begins, even in his own heart, to chicane in this manner. The moment he thinks of departing from the most staunch and positive adherence to what those inviolable precepts prescribe to him, he is no longer to be trusted, and no man can say what degree of guilt he may not arrive at. The thief imagines he does no evil, when he steals from the rich, what he supposes they may easily want, and what possibly they may never even know has been stolen from them. The adulterer imagines he does no evil, when he corrupts the wife of his friend, provided he covers his intrigue from the suspicion of the husband, and does not disturb the peace of the family. When once we begin to give way to such refinements, there is no enormity so gross of which we may not be capable.
The rules of justice may be compared to the rules of grammar; the rules of the other virtues, to the rules which critics lay down for the attainment of what is sublime and elegant in composition. The one, are precise, accurate, and indispensable. The other, are loose, vague, and indeterminate, and present us rather with a general idea of the perfection we ought to aim at, than afford us any certain and infallible directions for acquiring it. A man may learn to write grammatically by rule, with the most absolute infallibility; and so, perhaps, he may be taught to act justly. But there are no rules whose observance will infallibly lead us to the attainment of elegance or sublimity in writing; though there are some which may help us, in some measure, to correct, and ascertain the vague ideas which we might otherwise have entertained of those perfections.
