Mark Dever on expositional preaching:

   The practice of expositional preaching presumes a belief that what God says is authoritative for his people. It presumes that his people should hear it, and need to hear it, lest our congregations be deprived of what God intends to use for shaping us after his image. It presumes that God intends the church to learn from both Testaments, as well as from every genre of Scripture—law, history, wisdom, prophesy, gospels, and epistles. An expositional preacher who moves straight through books of the Bible and who regularly rotates between the different Testaments and genres of Scripture, I believe, is like a mother who serves her children food from every food group, not just their two or three favorite meals.

Back to the Heart of Worship
During a daylong seminar on Puritanism that I taught at a church in London, I remarked at one point that Puritan sermons were sometimes two hours long. A member of the class gasped audibly and asked, “What time did that leave for worship?” Clearly, the individual assumed that listening to God’s Word preached did not constitute worship. I replied that many English Protestants in former centuries believed that the most essential part of their worship was hearing God’s Word in their own language (a freedom purchased by the blood of more than one martyr) and responding to it in their lives. Whether they had time to sing, though not entirely insignificant, was of comparatively little concern to them.

—Mark Dever, What is a Healthy Church? (Crossway, 2007), 65, 67.