But in order that the society, and union, and affection between man and man may be completely preserved, they have laid it down that all benefits and injuries, which they call ὠφελήματα and βλάμματα, are likewise common; of which the former are advantageous, and the latter injurious. Nor have they been contented with calling them common, but they have also asserted their equality. But as for disadvantages and advantages, (by which words I translate εὐχρηστήματα and δυσχρηστήματα,) those they assert to be common, but they deny that they are equal. For those things which profit or which injure are either good or evil; and they must necessarily be equal. But advantages and disadvantages are of that kind which we have already called things preferred or rejected; and they cannot be equal. But advantages are said to be common; but things done rightly, and sins, are not considered common. But they think that friendship is to be cultivated because it is one of that class of things which is profitable. But although, in friendship, some people assert that the interest of a man's friend is as dear to him as his own; others, on the other hand, contend that every man has a greater regard for his own. Yet these latter confess that it is inconsistent with justice, for which we seem to be born, to take anything from another for the purpose of appropriating it to oneself. But philosophers of this school which I am speaking of, never approve of either friendship or justice being exercised or sanctioned for the sake of its usefulness: for they say that the same principles of usefulness may, at times, undermine or overturn them. In truth, neither justice nor friendship can have any existence at all, unless they be sought for their own sake. They contend also that all right, which has any pretence to the name and appellation, is so by nature; and that it is inconsistent with the character of a wise man, not only to do any injustice to any one, but even to do him any damage. Nor is it right to make such a league with one's friends as to share in all their good deeds, or to become a partner in every act of injustice; and they argue, with the greatest dignity and truth, that justice can never be separated from usefulness: and that whatever is just and equitable is also honourable; and, reciprocally,that whatever is honourable must be also just and equitable.
And to those virtues which we have discussed, they also add dialectics and natural philosophy; and they call both these sciences by the name of virtues: one, because it has reason, so as to prevent our assenting to any false proposition, or being even deceived by any plausible probability; and to enable us to maintain and defend what we were saying about good and evil. For without this act they think that any one may be led away from the truth and deceived; accordingly, if rashness and ignorance is in every case vicious, this power which removes them is properly named virtue.