The Nice Thing About Strangers
Creative Non-Fiction Short Stories. :) Travel, Oldsters, Love, and Compassion.
Citation
She was widely read enough to appreciate my literary wit but not so widely read that she knew my sources. I like that in a woman. I could say things to her like, ‘The most singular difference between happiness and joy is that happiness is a solid and joy a liquid.’ And safe in her ignorance of J.D. Salinger, I felt witty, charming, and yes, even youthful.
–David Mitchell. Cloud Atlas.
Vienna
The Nice Thing About Strangers 
Nice quote. It does perfectly describe the difference between the two – although perhaps I would characterise happiness as a gas, content as a solid.
Hmm, you’ll have to take that up with Salinger. 🙂
Brilliant … again -:)!
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Take Care,
Daniela