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To patristic poets and theologians, the food on the altar had suggested that Christ himself came as bread to hungry humankind or that he "digested" Christians, binding them to him as his body—i.e.,
the church. Hunger meant human vulnerability, which God comforted with food, or it meant human self-control, adopted in an effort to keep God's commandments. In the sermon and song, theology and story, of the high Middle Ages, however, the food on the altar was the God who became man; it was bleeding and broken flesh. Hunger was unquenchable desire; it was suffering. To eat God, therefore, was finally to become suffering flesh with his suffering flesh; it was to imitate the cross.
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Caroline Walker Bynum (Holy Feast and Holy Fast: The Religious Significance of Food to Medieval Women)