Aphorism 146 from Jenseits von Gut und Böse (Beyond Good and Evil) an 1886 book by the German philosopher Friedrich Nietzsche.

Translated from: Wer mit Ungeheuern kämpft, mag zusehn, dass er nicht dabei zum Ungeheuer wird. Und wenn du lange in einen Abgrund blickst, blickt der Abgrund auch in dich hinein.

Source: Gutenberg-DE

Translation source: Hollingdale
Misattributed

“The sick are the greatest danger for the healthy; it is not from the strongest that harm comes to the strong, but from the weakest.”

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Friedrich Nietzsche libro La genealogía de la moral

Essay 3, Aphorism 14
On the Genealogy of Morality (1887)

“Whom do I hate most among the rabble of today? The socialist rabble, the chandala apostles, who undermine the instinct, the pleasure, the worker’s sense of satisfaction with his small existence–who make him envious, who teach him revenge. The source of wrong is never unequal rights but the claim of “equal” rights.”

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Friedrich Nietzsche libro El Anticristo

Sec. 57
The Antichrist (1888)

“…aesthetic Socratism, the chief law of which is, more or less: "to be beautiful everything must first be intelligible" — a parallel to the Socratic dictum: "only the one who knows is virtuous."”

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Friedrich Nietzsche libro El nacimiento de la tragedia en el espíritu de la música

...aesthetischen Sokratismus...dessen oberstes Gesetz ungefähr so lautet: "alles muss verständig sein, um schön zu sein"; als Parallelsatz zu dem sokratischen "nur der Wissende ist tugendhaft."
Fuente: The Birth of Tragedy (1872), p. 62

“Socialism itself can hope to exist only for brief periods here and there, and then only through the exercise of the extremest terrorism. For this reason it is secretly preparing itself for rule through fear and is driving the word 'justice' into the heads of the half-educated masses like a nail so as to rob them of their reason… and to create in them a good conscience for the evil game they are to play.”

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Friedrich Nietzsche libro Human, All Too Human

Cambridge University Press, 1996, pp. 173-174
Human, All Too Human (1878)

“Philological considerations have slowly but surely taken the place of profound explorations of eternal problems. The question becomes: What did this or that philosopher think or not think? And is this or that text rightly ascribed to him or not? And even: Is this variant of a classical text preferable to that other? Students in university seminars today are encouraged to occupy themselves with such emasculated inquiries. As a result, of course, philosophy itself is banished from the university altogether.”

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Friedrich Nietzsche

So ist langsam an Stelle einer tiefsinnigen Ausdeutung der ewig gleichen Probleme ein historisches, ja selbst ein philologisches Abwägen und Fragen getreten: was der und jener Philosoph gedacht habe oder nicht, oder ob die und jene Schrift ihm mit Recht zuzuschreiben sei oder gar ob diese oder jene Lesart den Vorzug verdiene. Zu einem derartigen neutralen Sichbefassen mit Philosophie werden jetzt unsere Studenten in den philosophischen Seminarien unserer Universitäten angereizt: weshalb ich mich längst gewöhnt habe, eine solche Wissenschaft als Abzweigung der Philologie zu betrachten und ihre Vertreter danach abzuschätzen, ob sie gute Philologen sind oder nicht. Demnach ist nun freilich die Philosophie selbst von der Universität verbannt: womit unsre erste Frage nach dem Bildungswert der Universitäten beantwortet ist.
Anti-Education (1872)

“The objective of all human arrangements is through distracting one’s thoughts to cease to be aware of life.”

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Friedrich Nietzsche Untimely Meditations

trans. Hollingdale (1983), “Schopenhauer as educator,” p. 154
Untimely Meditations (1876)

“Could one count such dilettantes and old spinsters as that mawkish apostle of virginity, Mainländer, as a genuine German? In the last analysis he probably was a Jew (all Jews become mawkish when they moralize).”

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Friedrich Nietzsche

Sec. 357
The Gay Science (1882)

“Attributed across social media to TSZ. Is actually quoted in TSZ, Penguin Classics, Reg Hollingdale translation, in the introduction pg 12. Attributed to 'posthumously produced notes' [Nachlass? ] Hollingdale continues.' In a man who thinks like this, the dichotomy between thinking and feeling, intellect and passion, has really disappeared. He feels his thoughts. He can fall in love with an idea. An idea can make him ill.”

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Friedrich Nietzsche

Disputed