Man

This might perhaps be given, if we could first ascertain the function of man. For just as for a flute-player, a sculptor, or an artist, and, in general, for all things that have a function or activity, the good and the ‘well’ is thought to reside in the function, so would it seem to be for man, if he has a function. Have the carpenter, then, and the tanner certain functions or activities, and has man none? Is he born without a function? Or as eye, hand, foot, and in general each of the parts evidently has a function, may one lay it down that man similarly has a function apart from all these? What then can this be? Life seems to be common even to plants, but we are seeking what is peculiar to man. Let us exclude, therefore, the life of nutrition and growth. Next there would be a life of perception, but it also seems to be common even to the horse, the ox, and every animal. There remains, then, an active life of the element that has a rational principle; of this, one part has such a principle in the sense of being obedient to one, the other in the sense of possessing one and exercising thought.

Hence it is evident that a city is a natural production, and that man is naturally a political animal, and that whosoever is naturally and not accidentally unfit for society, must be either inferior or superior to man: thus the man in Homer, who is reviled for being “without society, without law, without family.” Such a one must naturally be of a quarrelsome disposition, and as solitary as the birds. The gift of speech also evidently proves that man is a more social animal than the bees, or any of the herding cattle: for nature, as we say, does nothing in vain, and man is the only animal who enjoys it. Voice indeed, as being the token of pleasure and pain, is imparted to others also, and thus much their nature is capable of, to perceive pleasure and pain, and to impart these sensations to others; but it is by speech that we are enabled to express what is useful for us, and what is hurtful, and of course what is just and what is unjust: for in this particular man differs from other animals, that he alone has a perception of good and evil, of just and unjust, and it is a participation of these common sentiments which forms a family and a city.

And here I specially stayed to show that, were there such machines exactly resembling in organs and outward form an ape or any other irrational animal, we could have no means of knowing that they were in any respect of a different nature from these animals; but if there were machines bearing the image of our bodies, and capable of imitating our actions as far as it is morally possible, there would still remain two most certain tests whereby to know that they were not therefore really men. Of these the first is that they could never use words or other signs arranged in such a. manner as is competent to us in order to declare our thoughts to others: for we may easily conceive a machine to be so constructed that it emits vocables, and even that it emits some correspondent to the action upon it of external objects which cause a change in its organs; for example, if touched in a particular place it may demand what we wish to say to it; if in another, it may cry out that it is hurt, and such like; but not that it should arrange them variously so as appositely to reply to what is said in its presence, as men of the lowest grade of intellect can do.