Carl Schmitt
In The Concept of the Political (1932), Carl Schmitt writes: "the specific political distinction to which political actions and motives can be reduced is that between friend and enemy."[2]
In his book Political Theology (1922), Schmitt presented a quite different, even contradictory logic of the political.
There the structural function of the exception - the sovereign's Godlike ability to declare a state of emergency and act outside the law - implies that the border between the law and lawlessness is permeable and, by extension, that hte realtionship of interiority and exteriority is unstable.