In his short book, Why Expository Preaching, David Jackman builds the case for preaching in an expository style. He will go on to explain that expository preaching is the method of letting the text reveal its original meaning. Jackman presents many advantages for using this style, the most compelling of them being that exposition is allowing God to speak clearly from Scripture and then giving helpful explanation of the meaning and implication of those words (cf Nehemiah 8:8).
Jackman gives a four-step method to prepare expository sermons that is very helpful. There are many other good books on the art of expository preaching, but many have long and tedious methods with many steps that aren’t compatible with every text or every expositor’s delivery style. Jackman presents a simple format that can be expanded upon according to the individual’s needs. He then ends with two examples of putting his method into practice.