The question stems from the sola scriptura argument which argues that the Bible contains all the Christian needs for faith and practice—the Bible is the sole authority. If that argument is true, how can one argue so dogmatically that expository preaching is the best method to deliver God’s Word to God’s people?
Martin poses this question in an effort to point out what seems to be an inconsistency with conversations on music. Namely, there is no verse in Scripture which directs expository preaching, just as there is no verse in Scripture which directs certain music. Yet one argument (expository preaching) is maintained while the other (position on music) is excoriated.
It is an interesting questions, one that I had not considered before.