Must We Go to War? (1937)
Context: The war method substitutes the doctrine of necessity for ethical ideals.... That is right which contributes to victory; that is wrong which magnifies the threat of defeat.
“Vulnerability is not knowing victory or defeat, it’s understanding the necessity of both; it’s engaging. It’s being all in.”
Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead
Help us to complete the source, original and additional information
Brené Brown 101
US writer and professor 1965Related quotes

“If they know nothing of victory, they are at least spared the knowledge of defeat.”
Source: The Picture of Dorian Gray

“To be defeated and not submit, is victory; to be victorious and rest on one's laurels, is defeat.”
(Late 1920s or the 1930s) Zbigniew Brzezinski in his introduction to Wacław Jędrzejewicz’s Piłsudski: A Life For Poland. Quoted from this website http://members.lycos.co.uk/jozefpilsudski/index2.html
Attributed

Hagakure (c. 1716)
Context: Although all things are not to be judged in this manner, I mention it in the investigation of the Way of the Samurai. When the time comes, there is no moment for reasoning. And if you have not done your inquiring beforehand, there is most often shame. Reading books and listening to people's talk are for the purpose of prior resolution.
Above all, the Way of the Samurai should be in being aware that you do not know what is going to happen next, and in querying every item day and night. Victory and defeat are matters of the temporary force of circumstances.

Bhagavad Gita, Ch II, verse 38
Srimad Bhagavad Gita, Ch. I-VI, 2013

Kein Operationsplan reicht mit einiger Sicherheit über das erste Zusammentreffen mit der feindlichen Hauptmacht hinaus.
"On Strategy" (1871)/"Über Strategie" (1871), as translated in Moltke on the Art of War: Selected Writings (1993) by Daniel J. Hughes and Harry Bell, p. 92; German collected in: Kriegsgeschichtliche Einzelschriften, H.13 (1890), hier zitiert nach: Militārische Werke, Band 2, Teil 2. Mittler & Sohn Berlin 1900. S. 291 books.google https://books.google.de/books?id=WHgvafaY1UIC&pg=PA291
Paraphrased variants:
No plan survives contact with the enemy.
Paraphrased in The Swordbearers : Studies in Supreme Command in the First World War (1963) by Correlli Barnett, p. 35
No battle plan ever survives contact with the enemy.
As quoted in Donnybrook : The Battle of Bull Run, 1861 (2005) by David Detzer, p. 233
Context: The tactical result of an engagement forms the base for new strategic decisions because victory or defeat in a battle changes the situation to such a degree that no human acumen is able to see beyond the first battle. In this sense one should understand Napoleon's saying: "I have never had a plan of operations."
Therefore no plan of operations extends with any certainty beyond the first contact with the main hostile force.

Galeazzo Ciano (1946) The Ciano Diaries, 1939-1943. Milan: Rizzoli. p. 594; Original cited in: Emerging Infectious diseases. Vol 2, Nr 1, Jan.-March 1996. p. 61
Original: Come sempre, la vittoria trova cento padri, e nessuno vuole riconoscere l'insuccesso.