“The statesman who should attempt to direct people in what manner they ought to employ their capitals, would not only load himself with a most unnecessary attention, but assume an authority which could safely be trusted, not only to no single person, but to no council or senate whatever, and which would nowhere be so dangerous as in the hands of a man who had folly and presumption enough to fancy himself fit to exercise it.”
Source: (1776), Book IV, Chapter II
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Adam Smith 175
Scottish moral philosopher and political economist 1723–1790Related quotes

“Ultimately, the only power to which man should aspire is that which he exercises over himself.”

A further quote sometimes purported to be from a speech to Congress, January 7, 1790 purportedly in the Boston Independent Chronicle, January 14, 1790, this is actually a corruption of a statement made in his first State of the Union Address, relating to the need for maintaining governmental troops and military preparedness:
:: A free people ought not only to be armed, but disciplined; to which end a uniform and well-digested plan is requisite; and their safety and interest require that they should promote such manufactories as tend to render them independent of others for essential, particularly military, supplies.
The proper establishment of the troops which may be deemed indispensable will be entitled to mature consideration. In the arrangements which may be made respecting it it will be of importance to conciliate the comfortable support of the officers and soldiers with a due regard to economy.
Misattributed, Spurious attributions

Tel homme qui dans un excès de mélancolie se tue aujourd’hui aimerait à vivre s’il attendait huit jours.
"Cato" http://www.voltaire-integral.com/Html/18/caton.htm (1764)
Citas, Dictionnaire philosophique (1764)

Source: The Life of Pasteur (1902), p. 19

Lieutenant Richard Sharpe, p. 81
Sharpe (Novel Series), Sharpe's Rifles (1988)