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Don't be put off by people who know what is not possible. Do what needs to be done, and check to see if it was impossible only after you are done.

Paul Hawken's Commencement Address to the Class at the University of Portland, www.commondreams.org. May 3, 2009.
Don't be put off by people who know what is not possible. Do what needs to be done, and check to see if it was impossible only after you are done.