Status Updates From Iron in the soul

I can’t tell if Sartre and Camus just wrote very similarly, or this is the result of the translations:
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The gentleman in the gold-rimmed spectacles was looking at him. Gomez felt ashamed, as though he had spoken his thoughts out loud. The Negroes were smiling, the young woman was smiling, the driver was smiling. *Not to grin is a sin.*

“This is where we get off,” Ritchie said, smiling.