Who really said it
In dreams begins responsibility
The line opens Responsibilities, the collection Yeats published through his sister’s Cuala Press in 1914 and then with Macmillan in 1916. It is the first of two epigraphs, and Yeats sets it in quotation marks with a credit underneath: Old Play. He gives no title, no dramatist and no date. I read the epigraph in two independent primary texts — the Cornell University copy of the Macmillan printing and Project Gutenberg’s edition — and both carry the same bare “Old Play” tag. Wikipedia calls the attribution obscure; nothing consulted here names the play. So this is a line Yeats chose, placed and made famous, and did not claim to have written.
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