“The doctrine of equality! … But there is no more venomous poison in existence: for it appears to be preached by justice itself, when it is actually the end of justice … "Equality to the equal; inequality to the unequal" — that would be true justice speaking: and its corollary, "never make the unequal equal".”
Expeditions of an Untimely Man, §48 Progress in my sense (Streifzüge eines Unzeitgemässen §48 Fortschritt in meinem Sinne). Chapter title also translated as: Skirmishes of an Untimely Man, Kaufmann/Hollingdale translation, and Raids of an Untimely Man, Richard Polt translation
Twilight of the Idols (1888)
Original: (de) Die Lehre von der Gleichheit! ... Aber es giebt gar kein giftigeres Gift: denn sie scheint von der Gerechtigkeit selbst gepredigt, während sie das Ende der Gerechtigkeit ist... "Den Gleichen Gleiches, den Ungleichen Ungleiches - das wäre die wahre Rede der Gerechtigkeit: und, was daraus folgt, Ungleiches niemals gleich machen."
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Friedrich Nietzsche 655
German philosopher, poet, composer, cultural critic, and cl… 1844–1900Related quotes

“The worst form of inequality is to try to make unequal things equal.”
Whilst a paraphrase this is based off of Aristotle's writings as Aristotle stated "For instance, it is thought that justice is equality, and so it is, though not for everybody but only for those who are equals; and it is thought that inequality is just, for so indeed it is, though not for everybody, but for those who are unequal" in https://www.loebclassics.com/view/aristotle-politics/1932/pb_LCL264.211.xml Politics, III. V. 8.
Misattributed
This first appears in 1974 in an explanation of Aristotle's politics in Time magazine, before being condensed to an epigram as "Aristotle's Axiom" in Peter's People (1979) by Laurence J. Peter

Dissenting in New York v. United States, 331 U.S. 284, 353 (1947).
Judicial opinions
“Aristotle's axiom: The worst form of inequality is to try to make unequal things equal.”
Source: Peter's People and Their Marvelous Ideas

“There is nothing more unequal than the equal treatment of unequal people.”

From Hearing Before the Committee on Interstate Commerce: United States Senate Sixty-second Congress pursuant to S. Res. 98 &c. (6 December 1911:803)

Concurring, Dennis v. United States, 339 U.S. 162, 184 (1950).
Judicial opinions

Not special justice, not social justice, but equal justice. We are the inheritors and the protectors of the civil rights movement. They are perverting it. They're perverting it, and they're doing it intentionally. And they're selling us a line of global nonsense.
2010s, 2010