85% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up
Letter to John Taylor, 27 February 1818, one of Keats's poetic 'axioms.' Standard quotation drops the letter's leading 'That'; full original reads 'That if Poetry comes not...'
Work
Letter to John Taylor
Sources checked
en.wikiquote.orgChecked using claude-sonnet-5, 21 August 2026raw wikitext fetch, exact letter text + citation
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