A splendid book, here is Kate Kellaway at The Guardian:
There are two things this book requires. First, it is best read aloud – it comes thrillingly to life – it sounds tremendous. Second, it repays close reading. Studying it is to listen in on a poet with perfect pitch. Getting the diction right – so that the ancient is neither modern nor archaic – is the challenge. And Heaney shows that plain words are stormproofed. It is about more than George Orwell’s tired prescription: “Never use a long word where a short one will do.” It is about how plain language, like plain speaking, has integrity. And it is weight-bearing. It carries. When he introduces uncommon, eye-catching (sometimes longer) words – scaresome, asperging, hotbloods – they stand out but work harder against their plain backgrounds. Take the sighting of the golden bough. The word “refulgent” is strikingly charged, surrounded by “clear”, “green-leafed” and “cold”. Refulgent breaks Orwell’s rule and stands out like the golden branch itself. Or consider the description of Aeneas’s father, Anchises: “A man in old age, worn out, not meant for duress.” “Duress” is the pleasing surprise here (so much better than everyday “hardship”) seizing attention while “old age” and “worn out” do their unobtrusive work.
I will reread it shortly, you can buy it here.