This responsiveness had nothing to do with that flabby impressionability which is dignified under the name of the “creative temperament.”— it was an extraordinary gift for hope,

from F. Scott Fitzgerald – The Great Gatsby (Chapter I) on Rap Genius

Meaning

In referring to when Nick compares Gatsby to Seismograph. but clears up his statement by say that Gatsby was not impressionable which many people might call “creative temperament” to make it sound dignified,Gatsby was sensitive and hopeful.

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