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She absolutely refused to reveal his name or even his type of work (although she gave him to understand that he had been, in a sense, a man of genius) and Fyodor was secretly grateful to her for this, realising that a ghost with neither name nor environment would fade out more easily - but nevertheless he experienced pangs of disgusting jealousy which he strove not to probe, but this jealousy was always present just around the corner, and the thought that somewhere, somewhen, for all he knew, he might meet the anxious, mournful eyes of this gentleman, caused everything around him to assume nocturnal habits of life, like nature during an eclipse.
The Gift - Vladimir Nabokov