*11* Of the things, then, that are essential to the sustenance of human life, some are inanimate (gold and silver, for example, the fruits of the earth, and so forth), and some are animate and have their own peculiar instincts and appetites. Of these again some are rational, others irrational. Horses, oxen, and the other cattle, [bees,] whose labour contributes more or less to the service and subsistence of man, are not endowed with reason; of rational beings two divisions are made--gods and men. Worship and purity of character will win the favour of the gods; and next to the gods, and a close second to them, men can be most helpful to men. *12* The same classification may likewise be made of the things that are injurious and hurtful. But as people think that the gods bring us no harm, they decide (leaving the gods out of the question) that men are most hurtful to men. #Necessity of man's helpfulness to man.# As for mutual helpfulness, those very things which we have called inanimate are for the most part themselves produced by man's labours; we should not have them without the application of manual labour and skill nor could we enjoy them without the intervention of man. And so with many other things: for without man's industry there could have been no provisions for health, no navigation, no agriculture, no ingathering or storing of the fruits of the field or other kinds of produce. *13* Then, too, there would surely be no exportation of our superfluous commodities or importation of those we lack, did not men perform these services. By the same process of reasoning, without the labour of man's hands, the stone needful for our use would not be quarried from the earth, nor would "iron, copper, gold, and silver, hidden far within," be mined. [AJ] That is, they make a false distinction between (1) moral rectitude that is at the same time expedient; (2) moral rectitude that is (apparently) not expedient; and (3) the expedient that is (apparently) not morally right. IV. Tecta vero, quibus et frigorum vis pelleretur et calorum molestiae sedarentur, unde aut initio generi humano dari potuissent aut postea subveniri,[173] si aut vi tempestatis aut terrae motu aut vetustate cecidissent, nisi communis vita ab hominibus harum rerum auxilia petere didicisset? *14* Adde ductus aquarum, derivationes fluminum, agrorum irrigationes, moles oppositas fluctibus, portus manu factos, quae unde sine hominum opere habere possemus? Ex quibus multisque aliis perspicuum est, qui fructus quaeque utilitates ex rebus iis, quae sint inanimae, percipiantur, eas nos nullo modo sine hominum manu atque opera capere potuisse.