Forging a durable, just, and comprehensive peace in the Middle East should mimic the construction of a bridge. On one side, the architects of peace must build forward from where they stand today: negotiate a cease-fire agreement, uphold it, and point it toward a lasting settlement. On the opposite side, others must define the contours of that permanent settlement and then reverse engineer it to link up with current efforts. If they follow this blueprint, those working on a longer-term vision