From Luther’s comments on John 3:
What should Christ do, and of what use is the Messiah? What kind of Messiah is He? . . . What does He do? He testifies. If He walks in such weakness and holds on His kingdship no more fimrly than that He testified, is there nothing else that He can do but preach and talk? If He is no soldier, possesses no land (not even the width of His palm) and no people, what does He do? Preach. Yes, such a Messiah are we bidden to accept.
How if it be God’s will that the Messiah should not come like a Caesar? Such an honour He will not grants unto them, that He should come arrayed with power like theirs. But that He comes so unadorned and does nothing but preach, that is unspeakable wisdom and strength, yes, the treasure of wisdom and knowledge, for whosoever believes in Him shall live eternally. But who sees this? You are not meant to see it. His reign and His preaching are a testimony. It is a preaching which testifies to things which no man can hear, see, or read in books of the law or anywhere else in the world. To witness means to speak of what the hearer has not seen. A judge does not judge what he sees. He must hear witnesses. But here He must preach and witness to something which men do not see, and that is how the Lord Christ is a witness to the Father in heaven, high uplifted above all men. He shall do nothing but preach, and His preaching shall be His testimony to the Father, how He is inclined, how He desires to make men blessed and to redeem them from their sins, and from the power of death and the devil. That is His testimony.
Luther might explain why Protestants have stressed sermons as the center piece of worship.
This would explain why Roman Catholics emphasize the Mass:
The Tridentine Decree on Justification is one of the most impressive achievements of the council. The leaders of the council had reported to Rome that “the significance of this council in the theological sphere lies chiefly in the article on justification, in fact this is the most important item the council has to deal with.” But reading it can give one a false impression of the significance of justification within Roman Catholicism. The decree was needed, and the doctrine received the attention that it did, because of the Protestant challenge. For the inner life of the Roman Catholic Church, however, the doctrine was not very important. In 1564 Pope Pius IV promulgated the Creed of the Council of Trent. Justification is mentioned just once in passing: “I embrace and accept each and every article on original sin and justification declared and defined in the most holy Council of Trent.” Shortly afterward, his successor, Pope Pius V, promulgated a Catechismus ex Decreto Concilii Tridentini, the so-called Roman Catechism. This contains only scattered passing references to justification, mostly in the context of teaching on the sacraments. The sacramental system is as central to the catechism as the doctrine of justification is peripheral, and the need to offer satisfaction for sins receives the sustained exposition denied to justification. Justification needed to be treated in response to the Protestant threat, but at the heart of the Christian life in Roman Catholicism is not justification but the sacramental system. The Council fathers turned from justification to the sacraments, and the Decree on the sacraments begins with the observation that all true righteousness begins with the sacraments; having been begun, increases through them; and, if lost, is restored through them. (Anthony Lane, “A Tale of Two Imperial Cities,” in Bruce L. McCormack, Justification in Perspective, 141-42)
Two paradigms, indeed, (but not much reform in the Counter-Reformation).