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It was just as the 1914 War burst on me that I made the discovery that 'legends' depend on the language to which they belong; but a living language depends equally on the 'legends' which it conveys by tradition. ... Volapuk, Esperanto, Ido, Novial, &c &c are dead, far deader than ancient unused languages, because their authors never invented any Esperanto legends.

J.R.R. Tolkien (2014). “The Letters of J.R.R. Tolkien”, p.231, Houghton Mifflin Harcourt
It was just as the 1914 War burst on me that I made the discovery that 'legends' depend on the language to which they belong; but a living language depends equally on the 'legends' which it conveys by tradition. ...