“Having made pleasure and pain, gain and loss, victory and defeat the same, you engage in battle for the sake of battle; thus you shell win and not incur sin.”

This is cited to Patton in Patton's Principles : A Handbook for Managers Who Mean It! (1982) by Porter B. Williamson as well as Leadership (1990) by William Safire and Leonard Safir, p. 47, but is also cited to Erwin Rommel‎ from his Infanterie Greift An [Infantry Attacks] (1937) in World War II : The Definitive Visual History (2009) by Richard Holmes, p. 128, and Timelines of History (2011) by DK Publishing, p. 392
Disputed

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.

Desire and fear
Source: "I am That." P.82.

My Enemies, I Thank You (كتاب شكرا أيها الأعداء)

Srimad Bhagavad Gita, Ch. I-VI, 2013
Context: In this verse Lord Krishna advises Arjuna how to fight the battle he is trying to avoid. Life in the world functions by ego, attachment and desire, which gives the rise to the idea of “likes” and “dislikes”. In this way the mind starts identifying all experiences in the world in terms of opposites, such as pleasure and pain, gain and loss, victory and defeat... Here, Sri Krishna is saying that if Arjuna has neither desire for heaven nor for sovereignty over the earth, then he should achieve equanimity of the mind. With equanimity of the mind one can achieve success in the war of life. Without it, one cannot remain unaffected by the pairs of opposites and will be continually tossed about by the waves of egocentric likes and dislikes.