must be very weak, if he can imagine that he has much occasion for them; and with regard to one who is negligent of it, the style of those writings is not such as is likely to awaken him to more attention. None of them tend to animate us to what is generous and noble. None of them tend to soften us to what is gentle and humane. Many of them, on the contrary, tend rather to teach us to chicane with our own consciences, and by their vain subtilties serve to authorize innumerable evasive refinements with regard to the most essential articles of our duty. That frivolous accuracy which they attempted to introduce into subjects which do not admit of it, almost necessarily betrayed them into those dangerous errors, and at the same time rendered their works dry and disagreeable, abounding in abstruse and metaphysical distinctions, but incapable of exciting in the heart any of those emotions which it is the principal use of books of morality to excite. The two useful parts of moral philosophy, therefore, are Ethics and Jurisprudence: casuistry ought to be rejected altogether, and the ancient moralists appear to have judged much better, who, in treating of the same subjects, did not affect any such nice exactness, but contented themselves with describing, in a general manner, what is the sentiment upon which justice, modesty, and veracity are founded, and what is the ordinary way of acting to which those virtues would commonly prompt us. Something, indeed, not unlike the doctrine of the casuists, seems to have been attempted by several philosophers. There is something of this kind in the third book of Cicero’s Offices, where he endeavours like a casuist to give rules for our conduct in many nice cases, in which it is difficult to determine whereabouts the point of propriety may lie. It appears too, from many passages in the same book, that several other philosophers had attempted something of the same kind before him. Neither he nor they, however, appear to have aimed at giving a complete system of this sort, but only meant to show how situations may occur, in which it is doubtful, whether the highest propriety of conduct consists in observing or in receding from what, in ordinary cases, are the rules of duty.