One of the ways the prophets develop the promise that the seed of the woman will crush the head of the serpent is by describing salvation as Zion giving birth. Zion, the recipient of the promises, the city of God, will give birth to the Messiah. Not only that, but all Christians have Zion as their mother. Salvation is childbearing. The pains of exile were but the pains of labor which culminate in the salvation through a birth, the birth of Christ.