XX. (66) "The name of one river is Pheison. This is that river which encircles all the land of Evilat; there is the country where there is gold. And the gold of that land is good; there also are the carbuncle and the sapphire stone." One of the four virtues is prudence, which Moses here calls Pheison: because the soul abstains, [pheiso�n from pheidomai, to spare, or abstain from.] from, and guards against, acts of iniquity. And it meanders in a circle, and flows all round the land of Evilat; that is to say, it preserves a mild, and gentle, and favourable constitution. And as of all fusible essences, the most excellent and the most illustrious is gold, so also the virtue of the soul which enjoys the highest reputation, is prudence. (67) And when he uses the expression, "that is the country where there is gold," he is not speaking geographically, that is, where gold exists, but that is the country in which that valuable possession exists, brilliant as gold, tried in the fire, and valuable, namely, prudence. And this is confessed to be the most valuable possession of God.
But with reference to the geographical position of virtue, there are two personages, each invested with distinctive qualities. One, the being who has prudence, the other, the being who exerts it; and these he likens to the carbuncle and the emerald.