“Defeat is most devastating at the moment of victory" Saint Dane”

Hagakure (c. 1716)
Context: People with intelligence will use it to fashion things both true and false and will try to push through whatever they want with their clever reasoning. This is injury from intelligence. Nothing you do will have effect if you do not use truth.
In affairs like law suits or even in arguments, by losing quickly one will lose in fine fashion. It is like sumo. If one thinks only of winning, a sordid victory will be worse than a defeat. For the most part, it becomes a squalid 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

At the conclusion of the North African Campaign in May 1943, as quoted by W. K. Hancock in SMUTS 2: The Fields of Force 1919-1950, p. 380

Source: The Acts of King Arthur and His Noble Knights

Source: Of Human Bondage (1915), Ch. 122

Source: Aphorisms (1880/1893), p. 84.

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.