Words are always getting conventionalized to some secondary meaning. It is one of the works of poetry to take the truants in custody and bring them back to their right senses. Poets are the policemen of language; they are always arresting those old reprobates the words.
Source:Letter to Ellen O'Leary (February 3, 1889); in The Letters of W. B. Yeats (ed. Rupert Hart-Davis, 1954), Page 109-110
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