1940s, The Question – What is your Hope' (c. 1940s)
“Until the last great war, a general expectation of material improvement was an idea peculiar to Western man. Now war and its aftermath have made economic and social progress a political imperative in every quarter of the globe. If we ignore this, there will be no peace. There has been a widening of horizons to which in the West we have been perhaps too insensitive. Yet it is as important as the extension of our vision into outer space.
Today continuing poverty and distress are a deeper and more important cause of international tensions, of the conditions that can produce war, than previously.”
The Four Faces of Peace (1957)
Help us to complete the source, original and additional information
Lester B. Pearson 11
14th Prime Minister of Canada 1897–1972Related quotes

Conclusion
1880s, Personal Memoirs of General U. S. Grant (1885)

"Eliminating Poverty Through Market-Based Social Entrepreneurship" in Global Urban Development Magazine (May 2005)

Quoted in The Times, UK (5 August 1980).
1980s and 1990s

Source: Nationalism and Culture (1937), Ch. 1 "The Insufficiency of Economic Materialism"
Context: The deeper we trace the political influences in history, the more are we convinced that the "will to power" has up to now been one of the strongest motives in the development of human social forms. The idea that all political and social events are but the result of given economic conditions and can be explained by them cannot endure careful consideration. That economic conditions and the special forms of social production have played a part in the evolution of humanity everyone knows who has been seriously trying to reach the foundations of social phenomena. This fact was well known before Marx set out to explain it in his manner. A whole line of eminent French socialists like Saint–Simon, Considerant, Louis Blanc, Proudhon and many others had pointed to it in their writings, and it is known that Marx reached socialism by the study of these very writings.

Source: The house on the hill (1949), Chapter 13, p. 125

(zh-CN) “战争是政治的继续”,在这点上说,战争就是政治,战争本身就是政治性质的行动,从古以来没有不带政治性的战争。
1930s, On Protracted Warfare (1938)

1920s, Address at the Black Hills (1927)

Source: 1990s and beyond, A McLuhan Sourcebook (1995), p. 291

Quote of Escher, 1959; as cited in '3. The approach to infinity' http://pi.math.cornell.edu/~mec/Winter2009/Mihai/section3.html, in: M.C. Escher and Hyperbolic Geometry http://pi.math.cornell.edu/~mec/Winter2009/Mihai/index.html - Math Explorer Club
1950's