“The object of government in peace and in war is not the glory of rulers or of races, but the happiness of the common man.”

Source: Sociology For The South: Or The Failure Of A Free Society (1854), p. 180

1820s, Letter to A. Coray (1823)
Source: Letters of Thomas Jefferson
Context: The equal rights of man, and the happiness of every individual, are now acknowledged to be the only legitimate objects of government. Modern times have the signal advantage, too, of having discovered the only device by which these rights can be secured, to wit: government by the people, acting not in person, but by representatives chosen by themselves, that is to say; by every man of ripe years and sane mind, who either contributes by his purse or person to the support of his country.

This attributed to Sun Tzu and his book The Art of War. Actually James Clavell’s foreword in The Art of War http://www.scribd.com/doc/42222505/The-Art-Of-War states http://www.collegetermpapers.com/TermPapers/History_Other/Sun_Tzu_vs_The_Wisdom_of_the_Desert.shtml, “’the true object of war is peace.’” Therefore the quote is stated by James Clavell, but the true origin of Clavell's quotation is unclear. Nonetheless the essence of the quote, that a long war exhausts a state and therefore ultimately seeking peace is in the interest of the warring state, is true, as Sun Tzu in Chapter II Waging Wars says that "There is no instance of a country having benefited from prolonged warfare. It is only one who is thoroughly acquainted with the evils of war that can thoroughly understand the profitable way of carrying it on." This has been interpreted by Lionel Giles http://www.dutchjoens.info/SunTzu%20-%20Art%20of%20War.pdf as "Only one who knows the disastrous effects of a long war can realize the supreme importance of rapidity in bringing it to a close."
Dr. Hiroshi Hatanaka, President of Kobe College, Nishinomiya, Hyōgo, Japan is recorded as saying "the real objective of war is peace" in Pacific Stars and Stripes Ryukyu Edition, Tokyo, Japan (10 February 1949), Page 2, Column 2.
Misattributed

Source: The New Ethics (1907), Silent Martyrs of Civilization, p. 64

"The Ruling Passion in Death" (1833), p. 75
Literary and Historical Miscellanies (1855)

Songs of the Soul (1971)

Speech at Zurich University (September 19, 1946) ( partial text http://www.churchill-society-london.org.uk/astonish.html) ( http://www.peshawar.ch/varia/winston.htm).
Post-war years (1945–1955)
Context: The salvation of the common people of every race and of every land from war or servitude must be established on solid foundations and must be guarded by the readiness of all men and women to die rather than submit to tyranny.

Book 2, chapter 9, p. 271.
Compare Vegetius De Re Militari: "Qui desiderat pacem, praeparet bellum" (Let him who desires peace prepare for war).
Descriptio Cambriae (The Description of Wales) (1194)

Source: Civil Government : Its Origin, Mission, and Destiny (1889), p. 10