Wallace Stevens once remarked: ‘One of the essential conditions to the writing of poetry is impetus.’ It’s a statement worth keeping in mind when confronting a new book of poems, because thinking about impetus helps us locate the concerns of the poet and the orientation of the book. Since poems are not objects so much as events, what drives a poem helps govern how it arrives at its destination – how, in fact, it is received by that welcoming stranger, the reader. Poems reveal their origins, whether they intend to or not. What Emerson says of character, that it ‘teaches above our wills’, that ‘we pass for what we are’, is true for poems as well. So it is not an idle question to ask of these books – these poets – their impetus, remembering that ‘impetus’ derives from the Latin ‘to seek.’