There is no evidence that W. B. Yeats said or wrote it. The idea goes back to the Greek writer Plutarch, whose essay “On Listening to Lectures” says the mind “does not require filling like a bottle” but “only requires kindling”. The Yeats credit seems to come from a misreading of a 1968 book.
What it means
Good teaching does not just pour facts into students; it sparks their curiosity so they go on thinking and learning for themselves.
Where it comes from
In “On Listening to Lectures” (Moralia 48C), Plutarch urges students to build on what they hear rather than simply store it. In F. C. Babbitt’s Loeb translation (1927): “For the mind does not require filling like a bottle, but rather, like wood, it only requires kindling to create in it an impulse to think independently and an ardent desire for the truth.”
Quote Investigator found no evidence for Yeats. It traces the “pail” and “fire” wording to James Johnson Sweeney’s 1968 book Vision and Image, which credits it to Plutarch in a sentence that also quotes Yeats on culture; by 1987 a book of quotations was crediting the pail line to Yeats. An Irish Times article by Robert Strong (2013) likewise found no trace of it in Yeats’s collected works or letters.