But there is another kind of adequacy which is specific to lyric poetry. This has to do with the ‘temple inside our hearing’ which the passage of the poem calls into being. It is an adequacy deriving from what Mandelstam called ‘the steadfastness of speech articulation’, from the resolution and independence which the entirely realized poem sponsors. It has as much to do with the energy released by linguistic fission and fusion, with the buoyancy generated by cadence and tone and rhyme and stanza, as it has to do with the poem’s concerns or the poet’s truthfulness. In fact, in lyric poetry, truthfulness becomes recognizable as a ring of truth within the medium itself. And it is the unappeasable pursuit of this note, a note tuned to its most extreme in Emily Dickinson and Paul Celan and orchestrated to its most opulent in John Keats, it is this which keeps the poet’s ear straining to hear the totally persuasive voice behind all the other informing voices.
—Seamus Heaney, “Crediting Poetry,” Nobel Prize lecture (1995).
[Seamus Heaney (1939-2013)]