The obligations of justice come next. They are summed up in two precepts that leave nothing to be desired: the first is to do no harm except in self-defence; the second, to bear our share in a perpetual exchange of good offices. And the foundation of justice is rightly placed in the faithful fulfilment of contracts—an idea perhaps suggested by Epicurus.[63] The virtue of fortitude is treated with similar breadth, and so interpreted as to cover the whole field of conduct, being identified not only with fearlessness in the face of danger, but with the energetic performance of every duty. In a word, it is opposed quite as much to slothfulness and irresolution as to physical timidity.[64] Temperance preserves its old meaning of a reasonable restraint exercised over the animal passions and desires; and furthermore, it receives a very rich significance as the quality by which we are enabled to discern and act up to the part assigned to us in life by natural endowment, social position, and individual choice. But this, as one of the most important ideas contributed by Stoicism to subsequent thought, must be reserved for separate discussion in the following section. In addition to its system of intermediate duties, the Stoic ethics included a code of casuistry which, to judge by some recorded specimens, allowed a very startling latitude both to the ideal sage and to the ordinary citizen. Thus, if Sextus Empiricus is to be believed, the Stoics saw nothing objectionable about the trade of a courtesan.[65] Chrysippus, like Socrates and Plato, denied that there was any harm in falsehoods if they were told with a good intention. Diogenes of Seleucia thought it permissible to pass bad money,[66] and to sell defective articles without mentioning their faults;[67] he was, however, contradicted on both points by another Stoic, Antipater. Still more discreditable were the opinions of Hecato, a disciple of Panaetius. He discussed the question whether a good man need or need not feed his slaves in a time of great scarcity, with an evident leaning towards the latter alternative; and also made it a matter of deliberation whether in case part of a ship’s cargo had to be thrown overboard, a valuable horse or a worthless slave should be the more readily sacrificed. His answer is not given; but that the point should ever have been mooted does not say much for the rigour of his principles or for the benevolence of his disposition.[68] Most outrageous of all, from the Stoic point of view, is the declaration of Chrysippus that Heracleitus and Pherecydes would have done well to give up their wisdom, had they been able by so doing to get rid of their bodily infirmities at the same time.[69] That overstrained theoretical severity should be accompanied by a corresponding laxity in practice is a phenomenon of frequent occurrence; but that this laxity should be exhibited so undisguisedly in the details of the theory itself,