"The fact of the matter," Seamus Heaney said in a 1997 interview with the Paris Review, "is that the most unexpected and miraculous thing in my life was the arrival in it of poetry." Throughout his career, Heaney, who received the 1995 Nobel Prize in Literature, maintained that poetry came to him from a mysterious source like a gift of grace. He also believed that the recipient of this sort of boon had an ethical obligation to share it...