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“If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.”
Source : John von Neumann's remarks as keynote speaker at the first national meeting of the Association for Computing Machinery (1947) as quoted in "Archaeology of computers: Reminiscences, 1945-1947" by Franz L. Alt, Communications of the ACM, Volume 15, Issue 7, special issue: Twenty-fifth anniversary of the Association for Computing Machinery (p. 694), July 1972.
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“Rich or poor, every child comes into the world with some imperative need of its own, which shapes its individuality.”
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“Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System.”
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“I think a good business book has one coherent idea that is richly played out.”
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“In this game he had acquired a great deal of muddled knowledge, more than one approximation and less than one certitude. And absence of energy, a curiosity that was too sharp to be crushed immediately, a lack of order in his ideas, a weakening of his spiritual boundaries, which were promptly twisted, an excessive passion for running along forked roads and wearying of the path as soon as he had started on it, mental indigestion demanding varied dishes, quickly tiring of the foods he desired, digesting almost all, but badly, was his state.”
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“I am a Quantum Engineer, but on Sundays I Have Principles.”
Source : Opening sentence of his "underground colloquium" in March 1983, as quoted by Nicolas Gisin in "Quantum [un]speakables: from Bell to quantum information", p. 199, 2002.
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“I'm not going to wear a red dress," she said. "It would look stunning, My Lady," she called. She spoke to the bubbles gathered on the surface of the water. "If there's anyone I wish to stun at dinner, I'll hit him in the face.”
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“I mean, time for me, I can make it go slow or fast, however I please. That's how I know it doesn't exist.”
Source : "Jaden and Willow Smith on Prana Energy, Time and Why School Is Overrated". Interview with Su Wu, tmagazine.blogs.nytimes.com. November 17, 2014. 
