Prudence and prosperity subsist, with reference to each other, as follows: Prudence indeed is effable and possesses reason; for it is something orderly and definite. But prosperity is ineffable and irrational; for it is something disorderly and indefinite. And prudence, indeed, is prior, but prosperity is posterior in beginning and in power. For the former is naturally adapted to govern and define; but the latter to be governed and defined. Moreover, both prudence and prosperity receive co-adaptation, since they concur in one and the same thing. For it is always necessary that the thing which bounds and co-arranges, should have a nature which is effable and participates of reason; but that the thing which is bounded and co-arranged, should be naturally ineffable and irrational. For the reason of the nature of the infinite and of that which bounds, thus subsists in all things. For infinites are always naturally disposed to be bounded and co-arranged by things which possess reason and prudence, since the former have the order of matter and essence with relation to the latter. But finites are co-arranged and bounded from themselves, since they have the order of cause, and of that which is energetic. The co-adaptation, however, of these natures in different things, produces a great and various difference of co-adapted substances. For in the comprehension of the whole of things, the co-adaptation of both the natures, i. e. of the nature which is always moved, and of that which is always passive, is the world. For it is not possible for the whole and the universe to be otherwise saved, than by that which is generated being co-adapted to that which is divine, and that which is always passive to that which is always moved.[71] In man, likewise, the co-adaptation of the irrational to the rational part of the soul, is virtue. For it is not possible in these, when there is sedition in both the parts, that virtue should have a subsistence. In a city also, the co-adaptation of the governors to the governed, produces strength and concord. For to govern is the peculiarity of the better nature; but to be governed, is easier to the subordinate [than to the more excellent] nature. And strength and concord are common to both. There is, however, the same mode of adaptation in the universe and in a family: for allurements[72] and erudition concur with reason in one and the same thing; and likewise pains and pleasures, prosperity and adversity. For the life of man requires intension and remission, sorrow and gladness, prosperity and adversity. For some things are able to collect and retain the intellect to industry and wisdom; but others impart relaxation and delight, and thus render the intellect vigorous and prompt to action. If however one of these prevails in life, then the life of man becomes of one part, and verges to one part, tending either to sorrow and difficulty, or to remission and levity. But the co-adaptation of all