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Sacraments

A test of the Reformation was the doctrine of the sacraments, and the crux of this question was the observance of the Eucharist. Erasmus was concerned that the sacramentarians, headed by Œcolampadius of Basel, were claiming Erasmus held views similar to their own in order to try to claim him for their schismatic and "erroneous" movement. When the Mass was finally banned in Basel in 1529, Erasmus immediately abandoned the city, as did the other expelled Catholic clergy.

In 1530, Erasmus published a new edition of the orthodox treatise of Algerus against the heretic Berengar of Tours in the eleventh century. He added a dedication, affirming his belief in the reality of the Body of Christ after consecration in the Eucharist, commonly referred to as transubstantiation, though Erasmus found the scholastic formulation of transubstantiation to stretch language past its breaking point.

By and large, the miraculous real change that interested Erasmus the author more than that of the bread is the transformation in the humble partaker. Erasmus wrote several notable pastoral books or pamphlets on sacraments, always looking through rather than at the rituals or forms: on marriage and wise matches, preparation for confession and the need for pastoral encouragement, preparation for death and the need to assuage fear, training and helping the preaching duties of priests under bishops, baptism and the need for that faithful to own the baptismal vows made for them.