“I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves.”
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Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes

As cited in: Problem Solving & Goal Setting blog, 24 October 2010.
1970s, The Art of Problem Solving, 1978

word play here: "rose" having the colloquial sense of "lesbian" in modern Russian, and "blue" meaning "gay"
On the "Orange Revolution" in Ukraine and the "Rose Revolution" in Georgia, News conference http://business.timesonline.co.uk/tol/business/markets/russia/article405454.ece, (23 December 2004).
2000 - 2005

First attributed to Lincoln in 2002, this seems a paraphrase of a statement in the Lyceum address of 1838, while incorporating language used by Thomas E. Dewey (c. 1944), who said "By the same token labor unions can never be destroyed from the outside. They can only fail if they fail to lend their united support to full production in a free society".
Misattributed

“If we had not just 10 oligarchs, but more like 1,000, all of Russia's problems would be solved.”
BBC News (26 March 2003) 'No regrets' for tarnished tycoon http://news.bbc.co.uk/2/hi/business/2868945.stm