“He who has conquered is not conqueror
Unless the conquered one confesses it.”
As quoted by Marcus Servius Honoratus in In Vergilii carmina comentarii (Commentaries on the poems of Virgil), Book XI https://web.archive.org/web/20141219124307/http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0053%3Abook%3D11%3Acommline%3D306
Original
Qui vincit non est victor nisi victus fatetur.
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Ennius 23
Roman writer -239–-169 BCRelated quotes

“Conquerors live by conquest; the first failure is a signal for the conquered to rise against them.”
Source: Star Bridge (1955), Chapter 6, “Flight” (p. 78)
Source: The Common Background of Greek and Hebrew Civilizations (1965 [1962]), Ch.VII Further Observations on Homer <!-- p.241, 1965 paper -->
Context: The warriors who constituted the aristocracy were awarded land grants to recompense them for their share in conquering the country. Both in Greece and in Israel, the theory of society was basically the same. The conquerors were the fighting and ruling stratum; the conquered natives were degraded to the labouring class. In Sparta the latter were called Helots. In Israel the Canaanites were the "hewers of wood and the drawers of water."

“Pain is no evil,
Unless it conquer us.”
St. Maura, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
Attributed
“He who suffers conquers.”
Vincit qui patitur.
Worldly Saints: The Puritans As They Really Were

David Ottaway (1978) Ethiopia: Empire in Revolution, Africana Publishing Company, p. 135
About Mengistu

“Conquered Greece took captive her savage conqueror and brought her arts into rustic Latium.”
Graecia capta ferum victorem cepit et artes intulit agresti Latio.
Book II, epistle i, lines 156–157
Epistles (c. 20 BC and 14 BC)

October 14, 1939; Vol. 1, p. 40.
Diary (1939 - 1945)