Book 7
5
But opposite is dear to opposite on the score of utility. For the like is useless to itself, and therefore master needs slave and slave master, man and wife need one another; and the opposite is pleasant and desirable as useful, not as contained in the End but as a means to the End—for when a thing has got what it desires it has arrived at its End, and does not strive to get its opposite, for example the hot the cold and the wet the dry.
6
But in a way love of the opposite is also love of the good. For opposites strive to reach one another through the middle point, for they strive after each other as tallies,The two halves of a bone or coin broken in half by two contracting parties and one kept by each, to serve as a token of identification when found to fit together. because in that way one middle thing results from the two.
7
Hence accidentally love of the good is love of the opposite, but essentially it is love of the middle, for opposites do not strive to reach one another but the middle. If when people have got too cold they are subjected to heat, and when they have got too hot to cold, they reach a mean temperature, and similarly in other matters; but without such treatment they are always in a state of desire, because they are not at the middle points.
8
But a man in the middle enjoys without passionate desire things by nature pleasant, whereas the others enjoy everything that takes them outside their natural state.
