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Definition and stakes

Portrait of Bertrand Russell Bertrand Russell,  Our Knowledge of the External World… (1914)

“ That is to say, if, in any sentence in which a thing is mentioned, you substitute a class for the thing, you no longer have a sentence that has any meaning: the sentence is no longer either true or false, but a meaningless collection of words. Appearances to the contrary can be dispelled by a moment’s reflection. For example, in the sentence, “Adam is fond of apples,” you may substitute mankind, and say, “Mankind is fond of apples.” ”
Source: Wikisource

Carveth Read,  Logic: Deductive and Inductive

“ Every general name, if used as a concrete term, has, or may have, a corresponding abstract term. Sometimes the concrete term is modified to form the abstract, as 'greedy—greediness'; sometimes a word is adapted from another language, as 'man—humanity'; sometimes a composite term is used, as 'mercury—the nature of mercury,' etc. The same concrete may have several abstract correlatives, as 'man—manhood, humanity, human nature' ”
Source: Gutenberg

W. F. Webster,  English: Composition and Literature

“ To express one’s thoughts correctly and with refinement requires absolute obedience to the common conventions of good literature.
The study of composition includes, first, the careful selection of materials and their effective arrangement; and second, a knowledge of the established conventions of literature: of spelling; of the common uses of the marks of punctuation,—period, question mark, exclamation point, colon, semicolon, comma; of the common idioms of our language; and of the elements of its grammar.
”
Source: Gutenberg

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