“The act of navigation is not favourable to foreign commerce, or to the growth of that opulence which can arise from it. … As defence, however, is of much more importance than opulence, the act of navigation is, perhaps, the wisest of all the commercial regulations of England.”

—  Adam Smith

Source: The Wealth of Nations (1776), Book IV, Chapter II

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Scottish moral philosopher and political economist 1723–1790

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“When the act of navigation was made, though England and Holland were not actually at war, the most violent animosity subsisted between the two nations. … It is not impossible, therefore, that some of the regulations of this famous act may have proceeded from national animosity. They are as wise, however, as if they had all been dictated by the most deliberate wisdom. National animosity at that particular time aimed at the very same object which the most deliberate wisdom would have recommended, the diminution of the naval power of Holland, the only naval power which could endanger the security of England.”

Adam Smith (1723–1790) Scottish moral philosopher and political economist

Source: The Wealth of Nations (1776), Book IV, Chapter II

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“There seem, however, to be two cases in which it will generally be advantageous to lay some burden upon foreign, for the encouragement of domestic industry. The first is, when some particular sort of industry is necessary for the defence of the country. The defence of Great Britain, for example, depends very much upon the number of its sailors and shipping. The act of navigation, therefore, very properly endeavours to give the sailors and shipping of Great Britain the monopoly of the trade of their own country, in some cases, by absolute prohibitions, and in others by heavy burdens upon the shipping of foreign countries.”

Adam Smith (1723–1790) Scottish moral philosopher and political economist

Source: (1776), Book IV, Chapter II

“One sad thing about this world is that the acts that take the most out of you are usually the ones that people will never know about.

(from 'Celestial Navigation')”

Anne Tyler (1941) American novelist
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“… you need more than luck to navigate successfully through a thousand sieves in succession.”

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“Of all the mind tools we acquire in the course of furnishing our brains from the stockpiles of culture, none are more important, of course, than words — first spoken, then written. Words make us more intelligent by making cognition easier, in the same way (many times multiplied) that beacons and landmarks make navigation in the world easier for simple creatures. Navigation in the abstract multidimensional world of ideas is simply impossible without a huge stock of movable, memorable landmarks that can be shared, criticized, recorded, and looked at from different perspectives.”

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“The principal lever relied on by the insurgents for exciting foreign nations to hostility against us, as already intimated, is the embarrassment of commerce. Those nations, however, not improbably saw from the first that it was the Union which made as well our foreign as our domestic commerce. They can scarcely have failed to perceive that the effort for disunion produces the existing difficulty, and that one strong nation promises more durable peace and a more extensive, valuable, and reliable commerce than can the same nation broken into hostile fragments.”

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“[T]he "dormant Commerce Clause" [is] a set of unwritten constitutional principles limiting state commercial regulation in the face of congressional silence coupled with the Constitution’s delegation to Congress of the power to regulate interstate commerce.”

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“To navigate is necessary, to live is not.”

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“I have not the smallest molecule of faith in aerial navigation other than ballooning”

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As a response to Major B. F. S. Baden Powell's request to join the Aeronautical Society, December 8, 1896 http://zapatopi.net/kelvin/papers/letters.html#baden-powell.
Often reproduced out of context and without citation to any primary source as "Heavier-than-air flying machines are impossible", like in The Experts Speak : The Definitive Compendium of Authoritative Misinformation (1984) by Christopher Cerf and Victor Navasky, p. 236
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“Decisions and plans made by others… [can be judged to be] quantitatively at least as important as the primary uncertainty arising from random acts of nature and unpredictable changes in consumers' preferences.”

Tjalling Koopmans (1910–1985) Dutch American economist

Source: Three Essays (1957), p. 163; as cited in: Richard Langlois (1989) Economics as a Process. p. 181

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