I can't think of a case where poems changed the world, but what they do is they change people's understanding of what's going on in the world.
Seamus HeaneyTo begin with, I wanted that truth to life to possess a concrete reliability, and rejoiced most when the poem seemed most direct, an upfront representation of the world it stood in for or stood up for or stood its ground against.
Seamus HeaneyThe poems I did write there [in Harvard] include Alphabets the 1984 Phi Beta Kappa poem and A Sofa in the Forties. And, of course, the John Harvard poem for the 350th anniversary Villanelle for an Anniversary.
Seamus Heaney