He then is by nature formed a slave who is qualified to become the chattel of another person, and on that account is so, and who has just reason enough to know that there is such a faculty, without being indued with the use of it; for other animals have no perception of reason, but are entirely guided by appetite, and indeed they vary very little in their use from each other; for the advantage which we receive, both from slaves and tame animals, arises from their bodily strength administering to our necessities; for it is the intention of nature to make the bodies of slaves and freemen different from each other, that the one should be robust for their necessary purposes, the others erect, useless indeed for what slaves are employed in, but fit for civil life, which is divided into the duties of war and peace; though these rules do not always take place, for slaves have sometimes the bodies of freemen, sometimes the souls; if then it is evident that if some bodies are as much more excellent than others as the statues of the gods excel the human form, every one will allow that the inferior ought to be slaves to the superior; and if this is true with respect to the body, it is still juster to determine in the same manner, when we consider the soul; though it is not so easy to perceive the beauty of [1255a] the soul as it is of the body. Since then some men are slaves by nature, and others are freemen, it is clear that where slavery is advantageous to any one, then it is just to make him a slave. CHAPTER VI