“It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them.”
As quoted in "Why Curiosity Driven Research?" by Robert V. Moody (17 February 1995) http://www.math.mun.ca/~edgar/moody.html
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Robert Oppenheimer 25
American theoretical physicist and professor of physics 1904–1967Related quotes

Source: The End of Science (1996), Ch. 2 : The End of Philosophy

“The world is founded on a pillar which is founded on the Deep.”
The Deep (1975)

“Esperanto was a very useful language, because wherever you went, you found someone to speak with.”
"How Do You Say ‘Billionaire’ in Esperanto?" in The New York Times (December 16, 2010) http://cityroom.blogs.nytimes.com/2010/12/16/how-do-you-say-billionaire-in-esperanto/

My Religion / Light in My Darkness, Ch 6 (1927)
Context: Self-culture has been loudly and boastfully proclaimed as sufficient for all our ideals of perfection. But if we listen to the best men and women everywhere … they will say that science may have found a cure for most evils; but it has found no remedy for the worst of them all — the apathy of human beings.