3.18

And yet some raise the question, for example Hecaton, whether it is possible for a slave to give a benefit to his master. For there are those who distinguish some acts as benefits, some as duties, some as services, saying that a benefit is something that is given by a stranger (a stranger is one who, without incurring censure, might have done nothing); that a duty is performed by a son, or a wife, or by persons that are stirred by the ties of kinship, which impels them to bear aid; that a service is contributed by a slave, whose condition has placed him in such a position that nothing that he can bestow gives him a claim upon his superior.
Moreover, he who denies that a slave can sometimes give a benefit to his master is ignorant of the rights of man; for, not the status, but the intention, of the one who bestows is what counts. Virtue closes the door to no man; it is open to all, admits all, invites all, the freeborn and the freedman, the slave and the king, and the exile; neither family nor fortune determines its choice — it is satisfied with the naked human being. For what protection would it find against sudden events, what great assurance would the human mind be able to hold out to itself if Fortune could rob it of unchangeable Virtue? If a slave cannot give a benefit to his master, no subject can give one to his king, no soldier to his general; for, if a man is restrained by supreme authority, what difference does it make what the nature of the authority is that restrains him? For, if the necessity of his lot and his fear of having to endure untold punishment prevent a slave from attaining the right to do a thank-worthy act, the same condition will also prevent the man who is under a king, and the man who is under a general; for these, under a different title, exercise equal authority. But a man can give a benefit to his king, a man can give a benefit to his general; therefore a slave also can give one to a master. It is possible for a slave to be just, it is possible for him to be brave, it is possible for him to be magnanimous; therefore it is possible also for him to give a benefit, for this also is one part of virtue. So true is it that slaves are able to give benefits to their masters that they have often caused their benefit to be their masters themselves.6