But, alas! There are also other preachers who-even though they are believers-preach in such lofty language that the people do not grasp the message. What is obvious in these situations is that, while the preacher may well be a believer, the people are dead-dead in their faith. Not only must we pastors proclaim the truth, we also must speak it so plainly that a peasant listening outside of the sanctuary can understand it and feel drawn into the church. We should preach so clearly that everyone would understand without a doubt that ‘this is the way to be saved. There is no other.’ I would not be surprised if God would hurl a lightning bolt at every preacher who fills his manuscript with fancy terms, intending to shine by his speech-making. The common people do not understand such language. At best, it may penetrate their minds, but it does not enter their hearts, where it ought to lodge.
Law & Gospel: How to Read and Apply the Bible by C. F. W. Walther (A Reader’s Edition)