“The language of poetry specializes in doubt. Without the doubters, everyone is cut off at the first question. Poetry does not presume to know, but is angling to get a glimpse of what is gradually coming into view; it aims to rightly identify what is looming; it intends to interrogate whatever is already in place. Poetry, whose definition remains evasive by necessity, advocates the lost road; and beyond speech — waiting, listening, and silence.”