XIV. (88) But, there being three leaders and authors of this race, the two at each extremity of it had their names changed, namely Abraham and Jacob: but the one in the middle, Isaac, always retained the same appellation. Why was this? Because both that virtue which is derived from teaching and that which is attained to by practice, admit of improvement and advancement: for the man who receives instruction desires a knowledge of those matters of which he is ignorant and he who applies himself to practice desires the crowns of victory, and the prizes which are proposed to his industrious and contemplation-loving soul. But the race which is self-taught and which derives all its learning from its own diligence inasmuch as it exists rather by nature than by study, was at the very beginning introduced as equal, and perfect, and even, there being no number whatever deficient of those which tend to completeness. (89) Nor indeed does Joseph have any such need, he who is the president of the necessities of the body; for he also changes his name, being called Psonthomphanech by the king of the country. And what the meaning of these names is we must explain; the name Joseph, being interpreted, signifies “an addition.” For things which are put by the side are an addition to those which exist by nature; for instance, gold, silver, possessions, revenues, the ministrations of servants, abundant treasure of heirlooms, and furniture, and other superfluities, and the infinite multitude of the different efficients of pleasure which some persons possess; (90) the provider and superintendant of which was called Joseph, or addition, by a very felicitous nomenclature: since he had undertaken the superintendence of the things which were to be brought in from without, and added to the natural things previously existing in the course of nature. And the sacred scriptures testify that this is the case, showing that he was the purveyor of the food of all the corporeal region, Egypt, having stored it up in his treasure-houses.