"
The specific political distinction to which political actions and
motives can be reduced is that between friend and enemy. This provides a definition in the sense of a criterion and not as an exhaustive definition or one indicative of substantial content. Insofar as it is not derived from other criteria, the antithesis of friend and enemy corresponds to the relatively independent criteria of other antitheses: good and evil in the moral sphere, beautiful and ugly in the aesthetic sphere, and so on. In any event it is independent, not in the sense of a distinct new domain, but in that it can neither be based on anyone antithesis or any combination of other antitheses, nor can it be traced to these.
If the antithesis of good and evil is not simply identical with that of beautiful and ugly, profitable and unprofitable, and cannot be directly reduced to the others, then the antithesis of friend and enemy must even less be confused with or mistaken for the others. The distinction of friend and enemy denotes the utmost degree of intensity of a union or separation, of an association or dissociation. It can exist theoretically and practically, without having simultaneously to draw upon all those moral, aesthetic, economic, or other distinctions. The political enemy need not be morally evil or aesthetically ugly; he need not appear as an economic competitor, and it may even be advantageous to engage with him in business transactions. But he is, nevertheless, the other, the stranger; and it is sufficient for his nature that he is, in a specially intense way, existentially something different and alien, so that in the extreme case conflicts with him are possible.
These can neither be decided by a previously determined general norm nor by the judgment of a disinterested and therefore neutral third party.Only the actual participants can correctly recognize, understand, and judge the concrete situation and settle the extreme case of conflict. Each participant is in a position to judge whether the adversary intends to negate his opponent's way of life and therefore must be repulsed or fought in order to preserve one's own form of existence. Emotionally the enemy is easily treated as being evil and ugly, because every distinction, most of all the political, as the strongest and most intense of the distinctions and categorizations, draws upon other distinctions for support. This does not alter the autonomy of such distinctions. Consequently, the reverse is also true: the morally evil, aesthetically ugly or economically damaging need not necessarily be the enemy; the morally good, aesthetically beautiful, and economically profitable need not necessarily become the friend in the specifically political sense of the word. Thereby the inherently objective nature and autonomy of the political becomes evident by virtue of its being able to treat, distinguish, and comprehend the friend-enemy antithesis independently of other antitheses."
—Carl Schmitt, The Concept of the Political. [emphasis mine]