After the Negative Confession the most valuable memorial of the character of the Egyptian conscience is found in the precepts of the moralist Ptah-hotep,[90] who lived probably in the time of the Twelfth Dynasty. This moralist laid particular emphasis upon the duties of rulers and of the rich and great. His maxims are intended as a sort of “Manual of the Perfect Official.” “If, having been of no account, thou hast become great, and if, having been poor, thou hast become rich, and if thou hast become governor of the city, be not hard-hearted on account of thy advancement, because thou hast become merely the guardian of the things which God has provided.”[91] In like words emphasis is laid upon the duties of gentleness and considerateness on the part of the administrator and the judge. In truth the doctrine of trusteeship of wealth and of office has never been more zealously taught than in these precepts of the early Egyptian moralist.[92] The teachings of Ptah-hotep respecting the duties of rulers would seem to have made effective appeal to the heart and conscience of even the holders of the royal office. In any event we find these lofty conceptions of the duties of kingship incarnated in the lives and deeds of several of the Pharaohs of the Old Kingdom. The view held by these monarchs respecting the nature of the royal office was almost exactly like that entertained by the so-called benevolent despots of the eighteenth century of our era. The inscriptions on the royal tomb boast not alone of exploits and triumphs in war, but the prince vaunts himself for having put no ward in mourning, for having made no distinction between the great and the humble, for having been the protector of the widow and the asylum of the orphan, and for having laid no unjust taxes.[93] [Sidenote: Slavery approved by the Egyptian conscience] The Egyptian conscience, like the conscience of the ancient world in general, did not condemn the institution of slavery. The relation of master and slave was looked upon by the Egyptians as perfectly natural and legitimate. The slave class, which included both whites and blacks, was recruited not only from the prisoners of war brought back by the Pharaohs from their numerous foreign conquests, but also from captives secured on regular man-hunting expeditions into the negro regions of the Upper Nile. The treatment of the slave was usually mild, and the development of the moral feelings had already in early times placed him under the protection of the gods. Thus in the judgment hall of Osiris the soul repudiates the sin of oppression by affirming, “I did not cause the slave to be misused by his master.”[94]