“A defeat borne with pride is also a victory.”

(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

Source: The Acts of King Arthur and His Noble Knights

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

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.

Then you exert and test yourself for a while.
Source: Jixiao Xinshu (1560; 1584), Chapter 14: The Chapter on the Fist Canon and the Essentials of Nimbleness

Book I, Ch. 30. Of Cannibals
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)

Speech http://books.google.com/books?id=Ihs8AAAAIAAJ&pg=PA407&dq=honorable+defeat (13 September 1844), Buffalo, New York, quoted in the Buffalo Commercial Advertiser (14 September 1844). Fillmore had lost the Whig nomination for governor of New York. The newspaper summary was: "He entreated them to enter the contest with zeal and enthusiasm; but as they valued the sacredness of their cause, and the stability of their principles, to resort to no unfair means: that an honorable defeat was better than a dishonorable victory."
1840s