Source: Reflections on public administration, 1947, p. 19
“In the performance of a task thus generally delineated I shall endeavor to select men whose diligence and talents will insure in their respective stations able and faithful cooperation, depending for the advancement of the public service more on the integrity and zeal of the public officers than on their numbers.”
First Inaugural Address (4 March 1829).
1820s
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American general and politician, 7th president of the Unite… 1767–1845Related quotes

Attributed by an unnamed "distinguished officer of the United States Government" in the Sixth Report of the American Temperance Society, May, 1833, pp. 10-11 http://books.google.com/books?id=h_c0wbAOQ5kC&pg=PA237&dq=%22The+habit+of+using+ardent+spirit%22.
Later variant: Were I to commence my administration again,... the first question I would ask respecting a candidate would be, "Does he use ardent spirits?"
Attributed

Inaugural address (1889)
Context: There is no constitutional or legal requirement that the President shall take the oath of office in the presence of the people, but there is so manifest an appropriateness in the public induction to office of the chief executive officer of the nation that from the beginning of the Government the people, to whose service the official oath consecrates the officer, have been called to witness the solemn ceremonial. The oath taken in the presence of the people becomes a mutual covenant. The officer covenants to serve the whole body of the people by a faithful execution of the laws, so that they may be the unfailing defense and security of those who respect and observe them, and that neither wealth, station, nor the power of combinations shall be able to evade their just penalties or to wrest them from a beneficent public purpose to serve the ends of cruelty or selfishness.

Letter to friend Loren Hickerson (December 13, 1941)

"Fooling the People as a Fine Art", La Follette's Magazine (April 1918)

Source: The Wealth of Nations (1776), Book I, Chapter XI, Part III, Conclusion of the Chapter, p. 292.
Context: The proposal of any new law or regulation of commerce which comes from this order, ought always to be listened to with great precaution, and ought never to be adopted till after having been long and carefully examined, not only with the most scrupulous, but with the most suspicious attention. It comes from an order of men, whose interest is never exactly the same with that of the public, who have generally an interest to deceive and even to oppress the public, and who accordingly have, upon many occasions, both deceived and oppressed it.

Source: The Corporation: The Pathological Pursuit of Profit and Power (2004), Chapter 6, Reckoning, p. 153

Ashby v. White (1703), 2 Raym. 956.
Ashby v. White (1703)

Preface
The Characteristics of the Present Age (1806)