I think what gets a poem going is an initiating line. Sometimes a first line will occur, and it goes nowhere; but other times - and this, I think, is a sense you develop - I can tell that the line wants to continue. If it does, I can feel a sense of momentum - the poem finds a reason for continuing.
Billy CollinsBy clarity I don't mean that we're always in kind of a simple area where everything is clear and comforting and understood. Clarity is certainly a way toward disorientation because if you don't start out - if the reader isn't grounded, if the reader is disoriented in the beginning of the poem, then the reader can't be led astray or disoriented later.
Billy Collins