which ought to have prevented its being used by any 'philosophic jurists.' What some of these mean by it is stated to be 'duties in which, though the act is obligatory, the particular occasions of performing it are left to our choice; as in the case of charity or beneficence, which we are indeed bound to practise, but not towards any defined person, or at any prescribed time.' But, according to this explanation, there are duties of which performance may not only be indefinitely postponed, even until a morrow that may never come, but of which performance at one time will warrant non-performance of them subsequently; so that, for instance, he who has behaved charitably on past occasions, may be uncharitable afterwards. 'In the more precise language' of other writers, we are told that while 'duties of perfect obligation are those duties in virtue of which a correlative right resides in some person or persons, duties of imperfect obligation are those which do not give birth to any right.' But, as where there is no right nothing can be due, it would seem from this that by duties of imperfect obligation are to be understood duties performance of which is not due. I hope to be pardoned for declining to accept these illusive distinctions as the boundaries which separate justice from the other components of morality. I neither understand how any obligation can be otherwise than perfect, nor do I recognise any duties whatever except those of justice. The main distinction between justice and all positive virtues I take to be that, whereas compliance with its behests is always imperative, compliance with theirs never is, but is always optional and discretionary. Of whatsoever is, for whatsoever reason, due, it is invariably justice, and justice alone, that demands payment or performance. Justice claims, and claims peremptorily, whatever is owing, but never puts forward the smallest pretension to anything that is not owing. But since whatever is _owing_ plainly _ought_ to be paid, and since justice never claims anything but what is owing, it is clear that there cannot be any merit in satisfying the claims of justice. Merit is possible only in actions which justice does not enjoin, but to which some other virtue exhorts.