All things that share a common quality are strongly drawn to that which is of their own kind. The earthy tends towards the earth; fluids flow together, aerial bodies likewise; and naught but force prevents their confluence. Fire rises upward on account of the elemental fire; and it is so ready to join in kindling with all the fire that is here that any matter pretty dry is easily set on fire, because that which hinders its kindling is the weaker element in its composition. Thus also, then, whatever partakes of the common intellectual nature hastens in like manner, or even more markedly, towards that which is akin to it. For the more it excels other natures, the stronger is its tendency to mix with and adhere to its kind. Accordingly, among irrational creatures we find swarms of bees, herds of cattle, nurture of the young, and love, of a sort. For even in animals there is a soul; and in the more noble natures a mutual attraction is found to be at work, such as does not exist in plants, or stones, or wood. Among the rational animals, again, there are societies and friendships, families and assemblies; and, in war, treaties and truces. Among beings still more excellent, there subsists, though they be placed far asunder, a certain kind of union, as among the stars. Thus ascent in the scale can produce a sympathy even in things that are widely distant. But mark what happens among us. It is only intellectual beings who forget the social concern for one another, and the mutual tendency to union. Here alone the social confluence is not seen. Yet are they environed and held by it, though they strive to escape; and nature always prevails. Observe and you will see my meaning: for sooner may one find some earthy thing which joins with nothing earthy, than a man severed and separate from all men.