“A machine has value only as it produces more than it consumes — so check your value to the community.”

Report on Manufactures (1791)
Context: To affirm, that the labour of the Manufacturer is unproductive, because he consumes as much of the produce of land, as he adds value to the raw materials which he manufactures, is not better founded, than it would be to affirm, that the labour of the farmer, which furnishes materials to the manufacturer, is unproductive, because he consumes an equal value of manufactured articles. Each furnishes a certain portion of the produce of his labor to the other, and each destroys a correspondent portion of the produce of the labour of the other. In the mean time, the maintenance of two Citizens, instead of one, is going on; the State has two members instead of one; and they together consume twice the value of what is produced from the land.

In an interview http://www.jwz.org/doc/linux.html in June 1998; he later claimed that "Bits and pieces of this article have been quoted out of context in lots of places"

Source: A Treatise On Political Economy (Fourth Edition) (1832), Book I, On Production, Chapter II, p. 69

Book II, Chapter I, On the Progress of Wealth, Section IX, p. 400 (See also: David Ricardo and aggregate demand)
Principles of Political Economy (Second Edition 1836)
Context: But such consumption is not consistent with the actual habits of the generality of capitalists. The great object of their lives is to save a fortune, both because it is their duty to make a provision for their families, and because they cannot spend an income with so much comfort to themselves, while they are obliged perhaps to attend a counting house for seven or eight hours a day...
... There must therefore be a considerable class of persons who have both the will and power to consume more material wealth then they produce, or the mercantile classes could not continue profitably to produce so much more than they consume.

also reported in the form: The peoples of the Balkans produce more history than they can consume, and the weight of their past lies oppressively on their present.
Although widely attributed to Winston Churchill (e.g. by the President of the British Academy, Professor Sir Adam Roberts), the quote is spurious.
The remark was quoted - although without attribution, and concerning East Central Europe instead - by Margaret Thatcher in her speech, "New Threats for Old," in Westminster College, Fulton, Mo., at a joint commemoration with the Churchill Centre of the "Iron Curtain" speech's 50th anniversary, on 9 March 1996: "It is, of course, often the case in foreign affairs that statesmen are dealing with problems for which there is no ready solution. They must manage them as best they can. That might be true of nuclear proliferation, but no such excuses can be made for the European Union's activities at the end of the Cold War. It faced a task so obvious and achievable as to count as an almost explicit duty laid down by History: namely, the speedy incorporation of the new Central European democracies--Poland, Hungary and what was then Czechoslovakia--within the EU's economic and political structures. Early entry into Europe was the wish of the new democracies; it would help to stabilize them politically and smooth their transition to market economies; and it would ratify the post-Cold War settlement in Europe. Given the stormy past of that region--the inhabitants are said to produce more history than they can consume locally--everyone should have wished to see it settled economically."
The sources of Thatcher's quote is likely a passage in the 1911 "Chronicles of Clovis", by Hector Hugh Munro (Saki), referring actually to Crete: "It was during the debate on the Foreign Office vote that Stringham made his great remark that "the people of Crete unfortunately make more history than they can consume locally." It was not brilliant, but it came in the middle of a dull speech, and the House was quite pleased with it. Old gentlemen with bad memories said it reminded them of Disraeli."
Misattributed
Source: Reinventing the Wheel http://www.gresham.ac.uk/lectures-and-events/reinventing-the-wheel-the-cost-of-neglecting-international-history. Footnote #5
Source: The speech is in James W. Muller, ed., Winston Churchill's "Iron Curtain" Speech Fifty Years Later (Columbia: University of Missouri Press, 1999), which collects the papers from that occasion. A readable .pdf is on the Churchill Centre website (scroll to pages 18-24): http://www.winstonchurchill.org/images/finesthour/Vol.01%20No.90.pdf
Source: Full text available here: https://en.wikisource.org/wiki/The_Chronicles_of_Clovis/The_Jesting_of_Arlington_Stringham

Japan's Nuclear Disaster Explained http://www.youtube.com/watch?v=rBvUtY0PfB8
Youtube

2000s, The Century: A Nation's-Eye View (2002)

"Nature Is My God" - interview with Fred Matser in Resurgence No. 184 (September-October 1997) http://www.resurgence.org/resurgence/184/gorbachev.htm
Context: We have retreated from the perennial values. I don't think that we need any new values. The most important thing is to try to revive the universally known values from which we have retreated.
As a young man, I really took to heart the Communist ideals. A young soul certainly cannot reject things like justice and equality. These were the goals proclaimed by the Communists. But in reality that terrible Communist experiment brought about repression of human dignity. Violence was used in order to impose that model on society. In the name of Communism we abandoned basic human values. So when I came to power in Russia I started to restore those values; values of "openness" and freedom.

Faith for Living (1940)