In this year of the 500th anniversary of the Reformation, much will be written about the theological emphases of that era in church history.
Timothy George writes about the way in which reformation theology transformed worship and the place and function of the sermon.
From his article, two ways in which preaching was transformed by the reformers:
First, they made the sermon the centerpiece of the church’s regular worship. Prior to the Reformation, the sermon was mostly an ad hoc event reserved for special occasions or seasons of the liturgical cycle, especially Christmas and Eastertide. Most sermons were preached in town squares or open fields. The reformers brought the sermon back inside the church and gave it an honored place in the public worship of the gathered community. The central role of preaching in Protestant worship can be seen in the way pulpits were raised to a higher elevation as families gathered with their children to hear the Word proclaimed.
Second, the reformers introduced a new theology of preaching. They were concerned that the Bible take deep root in the lives of the people. The Word of God was meant not only to be read, studied, translated, memorized, and meditated on; it was also to be embodied in the life and worship of the church. What might be called the practicing of the Bible—its embodiment—was most clearly expressed in the ministry of preaching. Martin Luther believed that a call to the preaching office was a sacred trust and shouldn’t be used for selfish purposes. “Christ did not establish the ministry of proclamation to provide us with money, property, popularity, honor, or friendship,” he said.
George includes some quotes from the Reformers and more material on the subject in this article at the Gospel Coalition.