The structure of the procession is often designed to demonstrate the hierarchy of heaven in that the sacred host is followed in procession by various Church organisations carrying the banners of their patron saints.
Thomas Aquinas also wrote a powerful prayer for the festival, that encompasses many aspects of the doctrine of the Eucharist:
In 1551, the Council of Trent described the Feast Day as a 'triumph over heresy'. They meant by this that when Christians celebrated Corpus Christi they affirmed their belief in the doctrine of transubstantiation, and thus the victory of the Church over those heretics who denied that the consecrated wafer became the real body of Christ during the Mass.
From the Middle Ages onwards, special Corpus Christi plays were staged to mark the occasion.
John Paul II on the Eucharist - "Christ, 'the living bread which came down from heaven,' is the only one who can satisfy man's hunger at all times and in all parts of the earth," he said. In the Eucharist, "Christ gives his Body and Blood for the life of humanity. And all those who nourish themselves worthily at his table, become living instruments of his presence of love, mercy and peace,"