In 2018, the ferocious American poet-critic William Logan took time off from routinely, invigoratingly eviscerating contemporary poets to write Dickinson’s Nerves, Frost’s Woods: Poetry in the Shadow of the Past – a study of classic poems in their historical contexts. It was an informative, interesting exercise, prefaced by this significant reservation: ‘Knowledge of the circumstance is not ipso facto knowledge of the poem.