“The enemy is not merely any competitor or just any partner of a conflict in general. He is also not the private adversary whom one hates. An enemy exists only when, at least potentially, one fighting collectivity of people confronts a similar collectivity. The enemy is solely the public enemy, because everything that has a relationship to such a collectivity of men, particularly to a whole nation, becomes public by virtue of such a relationship.”
The Concept of the Political (1927)
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Carl Schmitt 36
German jurist, political theorist and professor of law 1888–1985Related quotes

Letter to George Washington (9 October 1776)

Comment on LiveJournal http://www.livejournal.com/users/qwantz/24526.html

Jasper Ridley, Tito: A Biography (Constable and Company Ltd., 1994), p. 323.
Other

1990s, Long Walk to Freedom (1995)
“Conflict defines nations. Enemies justify armies. Wars glorify generals.”
Ch 7
The Rahotep series, Book 3: Egypt: The Book of Chaos (2011)
Context: Conflict defines nations. Enemies justify armies. Wars glorify generals. Without his great enemy to give him purpose and meaning, he will be significantly diminished. He will have to come to terms with us.

Yesterday and Today, 1917-1967: Contemporaries Report on the Progress of German Soviet Friendship - Page 105 - by Verlag Zeit im Bild - Soviet Union - 1967.

“Men are by nature merely indifferent to one another; but women are by nature enemies.”
Vol. 2 "On Women" as translated in Essays and Aphorisms (1970), as translated by R. J. Hollingdale
Parerga and Paralipomena (1851), Counsels and Maxims

1950s, What Desires Are Politically Important? (1950)
Context: We love those who hate our enemies, and if we had no enemies there would be very few people whom we should love.
All this, however, is only true so long as we are concerned solely with attitudes towards other human beings. You might regard the soil as your enemy because it yields reluctantly a niggardly subsistence. You might regard Mother Nature in general as your enemy, and envisage human life as a struggle to get the better of Mother Nature. If men viewed life in this way, cooperation of the whole human race would become easy. And men could easily be brought to view life in this way if schools, newspapers, and politicians devoted themselves to this end. But schools are out to teach patriotism; newspapers are out to stir up excitement; and politicians are out to get re-elected. None of the three, therefore, can do anything towards saving the human race from reciprocal suicide.

Chapter 32 https://www.marxists.org/reference/archive/mao/works/red-book/ch32.htm, originally published in Talks at the Yenan Forum on Literature and Art (May 1942), Selected Works, Vol. III, p. 84.
Quotations from Chairman Mao Zedong (The Little Red Book)