Luther's Works, Volume 48: Letters 1Luther wrote the 119 letters in this volume between 1507 and 1522, during the momentous years that saw him change from an obedient and determined priest of his Order to a vigorous critic of the sale of indulgences and finally to the leader of a reformed church. In these letters Luther discusses his posting of the Ninety five Theses, the disputations at Heidelberg, Augsburg, and Leipzig, and the bull excommunicating him.