Ante-Nicene Fathers, Vol VII:
Lactantius: Chap. LVI.—Of justice, which is the worship of the true God

Chap. LVI.—Of Justice, Which is the Worship of the True God.

For if justice is the worship of the true God (for what is so just with respect to equity, so pious with respect to honour, so necessary with respect to safety, as to acknowledge God as a parent, to reverence Him as Lord, and to obey His law or precepts?), it follows that the philosophers were ignorant of justice, for they neither acknowledged God Himself, nor observed His worship and law; and on this account they might have been refuted by Carneades, whose disputation was to this effect, that there is no natural justice, and therefore that all animals defended their own interests by the guidance of nature itself, and therefore that justice, if it promotes the advantages of others and neglects its own, is to be called foolishness. But if all people who are possessed of power, and the Romans themselves, who are masters of the whole world, were willing to follow justice, and to restore to every one his property which they have seized by force and arms, they will return to cottages and a condition of want. And if they did this, they might indeed be just, but they must of necessity be considered foolish, who proceed to injure themselves for the advantage of others. Then, if any one should find a man who was through a mistake offering for sale gold as mountain-brass, or silver as lead, and necessity should compel him to buy it, will he conceal his knowledge and buy it for a small sum, or will he rather inform the seller of its value? If he shall inform him, he will manifestly be called just; but he will also be foolish, for conferring an advantage upon another, and injuring himself. But it is easy to judge in a case of injury. What if he shall incur danger of his life, so that it shall be necessary for him either to kill another or to die, what will he do? It may happen that, having suffered shipwreck, he may find some feeble person clinging to a plank; or, his army having been defeated, in his flight he may find a wounded man on horseback: will he thrust the one from the plank, the other from his horse, that he himself may be able to escape? If he shall wish to be just, he will not do it; but he will also be judged foolish, who in sparing the life of another shall lose his own. If he shall do it, he will indeed appear wise, because he will provide for his own interests; but he will also be wicked, because he will commit a wrong.