Ordinary language is all right.
One could divide humanity into two classes:
those who master a metaphor, and those who hold by a formula.
Those with a bent for both are too few, they do not comprise a class.
Your life will vanish.
'In this malady, that which is, is wholly to themselves'
'In this room he felt the chalky atmosphere of the classroom again, the same sort of chair, the same boredom.'
The first speech Flaubert actually quotes in the narration of Sentimental Education, after Moreau and Arnoux have already had quite a conversation, its contents reported in the narrator's summary, is still not even quite quoted:
But he broke off to observe the ship's funnel and muttered a lengthy, rapid calculation, to work out 'how often each piston, at so many strokes per minute, would have to etc.'—and, once he had arrived at an answer, he talked about the beauties of the landscape.