write for the ear

I have spent my life in clearing out of poetry every phrase written for the eye, and bringing all back to the syntax that is for the ear alone.
[...]
"Write for the ear," I thought, "so that you may be instantly understood, as when actor or folk-singer stands before an audience."

—W. B. Yeats, “An Introduction for My Plays” (1937, but not published until 1961 in Essays & Introductions).

[n.b.: I went to a presentation by Deanie Rowan Blank on W.B. Yeats today at the Hartford Public Library, and this quote came up. So I ran down the source and posted it.]