HUMAN1 SOCIAL ORGANIZATION is something necessary. The philosophers expressed this fact by saying: "Man is `political' by nature."2 That is, he cannot do without the social organization for which the philosophers use the technical term "town" (polis). This is what civilization means. (The necessary character of human social organization or civilization) is explained by the fact that God created and fashioned man in a form that can live and subsist only with the help offood. He guided man to a natural desire for food and instilled in him the power that enables him to obtain it.
However, the power of the individual human being is not sufficient for him to obtain (the food) he needs, and does not provide him with as much food as he requires to live. Even if we assume an absolute minimum of food-that is, food enough for one day, (a little) wheat, for instance-that amount of food could be obtained only after much preparation such as grinding, kneading, and baking. Each of these three operations requires utensils and tools that can be provided only with the help of several crafts, such as the crafts of the blacksmith, the carpenter, and the potter. Assuming that a man could eat unprepared grain, an even greater number of operations would be necessary in order to obtain the grain: sowing and reaping, and threshing to separate it from the husks of the ear. Each of these operations requires a number of tools and many more crafts than those just mentioned. It is beyond the power of one man alone to do all that, or (even) part of it, by himself. Thus, he cannot do without a combination of many powers from among his fellow beings, if he is to obtain food for himself and for them. Through co*operation, the needs of a number of persons, many times greater than their own (number), can be satisfied.
Likewise, each individual needs the help of his fellow beings for his defense, as well. When God fashioned the natures of all living beings and divided the various powers among them, many dumb animals were given more perfect powers than God gave to man. The power of a horse, for instance, is much greater than the power of man, and so is the power of a donkey or an ox. The power of a lion or an elephant is many times greater than the power of (man).
Aggressiveness is natural in living beings. Therefore, God gave each of them a special limb for defense against aggression. To man, instead, He gave the ability to think, and the hand. With the help of the ability to think, the hand is able to prepare the ground for the crafts. The crafts, in turn, procure for man the instruments that serve him instead of limbs, which other animals possess for their defense. Lances, for instance, take the place of horns for goring, swords the place of claws to inflict wounds, shields the place of thick skins, and so on. There are other such things. They were all mentioned by Galen in De usu partium.3