"I know of no sadder or deeper fall from human reason than Schmitt's barbarous and pathetic delusion about the friend-foe principle. His inhuman cerebrations do not even hold water as a piece of formal logic. For it is not war that is serious but peace. Only by transcending that pitiable friend-foe relationship will mankind enter into the dignity of man's estate. Schmitt's brand of "seriousness" merely takes us back to the savage level."
January 1, 1970
https://en.wikiquote.org/wiki/Carl_Schmitt