Chapter 1, Part 7 - The Great Struggle of the Late Middle Ages (p. 56).
It became clear by the late Middle Ages that the Sacrament was controversial. Especially in Bohemia a desire for more frequent communion arose. At the same time there were moves to reject the explanation of transubstantiation and replace it with another explanation, that of symbolic presence. Divisions increased and the theological landscape was clouded by the piety which had not yet begun to distinguish Law and Gospel (p. 60). The stage was thus set for Luther’s Reformation.