XXI. (68) "And the name of the second river is Gihon. This is that which encircles all the land of Ethiopia." Under the symbol of this river courage is intended. For the name of Gihon being interpreted means chest, or an animal which attacks with its horns; each of which interpretations is emblematical of courage. For courage has its abode about the chest, where also is the seat of the heart, and where man is prepared to defend himself. For courage is the knowledge of what is to be withstood, and of what is not to be withstood, and of what is indifferent. And it encircles and surrounds Ethiopia, making demonstrations of war against it; and the name of Ethiopia, being interpreted, means humiliation. And cowardice is a humiliating thing; but courage is adverse to humiliation and to cowardice. (69) "And the third river is the Tigris; this is that which flows in front of Assyria." The third virtue is temperance, which resolutely opposes that kind of pleasure which appears to be the directress of human infirmity. For the translation of the name Assyrians in the Greek tongue is euthynontes, (directors). And he has likened desire to a tiger, which is the most untameable of beasts; it being desire about which temperance is conversant.