From An Insight, An Idea with Tim Berners-Lee http://www.weforum.org/sessions/summary/insight-idea-tim-berners-lee at 27:27 (25 January 2013)
Context: When somebody has learned how to program a computer … You're joining a group of people who can do incredible things. They can make the computer do anything they can imagine.
“Sometimes it is the people no one can imagine anything of who do the things no one can imagine.”
Variant: Sometimes it is the people who no one imagines anything of who do the things that no one can imagine.
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Alan Turing 33
British mathematician, logician, cryptanalyst, and computer… 1912–1954
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“Those who can imagine anything, can create the impossible.”
"Quotes", The Educated Imagination (1963), Talk 1: The Motive For Metaphor http://northropfrye-theeducatedimagination.blogspot.ca/2009/08/1-motive-for-metaphor.html
Context: At the level of ordinary consciousness the individual man is the centre of everything, surrounded on all sides by what he isn't. At the level of practical sense, or civilization, there's a human circumference, a little cultivated world with a human shape, fenced off from the jungle and inside the sea and the sky. But in the imagination anything goes that can be imagined, and the limit of the imagination is a totally human world.
“It is not a thing that you can imagine. It only is. After that, there can be no imagining.”
Source: Everything Is Illuminated
Steppin' off the Edge http://steppinofftheedge.com/podcast/philosophy-of-open-source/, Podcast Interview, January 2011
“The mark of the neurotic: to imagine that you're the only one who cares deeply for anything.”
The Complete Neurotic's Notebook (1981), Neurotics and neurosis
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Letter (5 May 1855), published in Florence Nightingale : An Introduction to Her Life and Family (2001), edited by Lynn McDonald, p. 141