This means that they preach biblical truth derived from a process of exegesis. The preacher uses what is termed the historical, grammatical literal method to interpret the Scriptures.  It is preaching in which its sole source is from the Scripture. The message come from the Scriptures through careful study. It is preaching that  explains the original God intended meaning of the passage to its original recipients and applies the timeless principles to our modern-day situations.

⁸ They read from the book, from the Law of God, clearly, and they gave the sense, so that the people understood the reading. Nehemiah 8:8 (ESV)