“While no man in his right mind would advocate sending our ground forces into continental China, and such was never given a thought, the new situation did urgently demand a drastic revision of strategic planning if our political aim was to defeat this new enemy as we had defeated the old.”

Translation by Lionel Giles
Source: The Art of War, Chapter IV · Disposition of the Army

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.

Address in Addis Ababa (5 May 1941), as translated in My Life and Ethiopia's Progress, Vol. 2, (1999), p. 165.
Context: Today is the day on which we defeated our enemy. Therefore, when we say let us rejoice with our hearts, let not our rejoicing be in any other way but in the spirit of Christ. Do not return evil for evil. Do not indulge in the atrocities which the enemy has been practicing in his usual way, even to the last.
Take care not to spoil the good name of Ethiopia by acts which are worthy of the enemy. We shall see that our enemies are disarmed and sent out the same way they came. As Saint George who killed the dragon is the Patron Saint of our army as well as of our allies, let us unite with our allies in everlasting friendship and amity in order to be able to stand against the godless and cruel dragon which has newly risen and which is oppressing mankind.

p 189
21 Yaks And A Speedo (2013)

As quoted in John M. Cohen (1987) Integrated Rural Development: The Ethiopian Experience and the Debate, p. 213

Radio broadcast in response to the German invasion (22 June 1941) http://historicalresources.org/2008/08/26/molotov-reaction-to-german-invasion-of-1941/
Context: This is not the first time that our people have had to deal with an attack of an arrogant foe. At the time of Napoleon’s invasion of Russia our people’s reply was war for the fatherland, and Napoleon suffered defeat and met his doom.
It will be the same with Hitler, who in his arrogance has proclaimed a new crusade against our country. The Red Army and our whole people will again wage victorious war for the fatherland, for our country, for honor, for liberty.
The government of the Soviet Union expresses the firm conviction that the whole population of our country, all workers, peasants and intellectuals, men and women, will conscientiously perform their duties and do their work. Our entire people must now stand solid and united as never before.
Each one of us must demand of himself and of others discipline, organization and self-denial worthy of real Soviet patriots, in order to provide for all the needs of the Red Army, Navy and Air Force, to insure victory over the enemy.
The government calls upon you, citizens of the Soviet Union, to rally still more closely around our glorious Bolshevist party, around our Soviet Government, around our great leader and comrade, Stalin. Ours is a righteous cause. The enemy shall be defeated. Victory will be ours.

1950s, Loving Your Enemies (Christmas 1957)
Context: Third we must not seek to defeat or humiliate the enemy but to win his friendship and understanding. At times we are able to humiliate our worst enemy. Inevitably, his weak moments come and we are able to thrust in his side the spear of defeat. But this we must not do. Every word and deed must contribute to an understanding with the enemy and release those vast reservoirs of goodwill which have been blocked by impenetrable walls of hate.

Tears and Saints (1937)

Vol. I, p. 402
William Lloyd Garrison 1805-1879 (1885)