“The specific political distinction to which political actions and motives can be reduced is that between friend and enemy.”
The Concept of the Political (1927)
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Carl Schmitt 36
German jurist, political theorist and professor of law 1888–1985Related quotes

“Political criticism is our enemies' best friend.”
Newsday, October 20, 2003
《乌克兰宪政危机与政治决断》 ["Ukraine's constitutional crisis and political decisions"] (2004), translated by David Ownby in Rethinking China's Rise, p. 27

Six Principles of Political Realism, § 4.
Politics Among Nations (1948)
Context: Political realism is aware of the moral significance of political action. It is also aware of the ineluctable tension between the moral command and the requirements of successful political action. And it is unwilling to gloss over and obliterate that tension and thus to obfuscate both the moral and the political issue by making it appear as though the stark facts of politics were morally more satisfying than they actually are, and the moral law less exacting than it actually is.

Rampart Institute, p.411
The Fundamental of Liberty (1988)
The State of Democratic Theory (2003), Chapter 5. Democracy and Distribution.