"diseases, as all experience shows, are adjectives, not noun substantives."

Previous Quote

The breakdown of our language, evident in the misuse, i.e., the misunderstanding of nouns and adjectives, is most grave, though perhaps not so conspicuous, in the handling of prepositions, those modest little connectives that hold the parts of a phrase or a sentence together. They are the joints of any language, what make it, literally, articulate.

— Mary McCarthy