Here in paperback is the celebrated eleventh book of poems by Galway Kinnell. The book’s title derives from Walt Whitman’s “Last Invocation”: “Strong is your hold O mortal flesh, / Strong is your hold O love.” In this striking collection, Kinnell gives us poems of intermingling with the natural world, love poems and evocations of sexuality, poems about his father, his children, poet friends, poet heroes, and mythic figures. Included also is “When the Towers Fell,” his stunning requiem for those who died in the World Trade Center on 9/11.