See Stuart Olyott's book Preaching - Pure and Simple. The main points of this are summarized in my book The Regulative Principle of Worship: Explained and Applied. Mr. Olyott does a great job of showing what preaching is by his study in the Greek words used for preaching.

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Daniel Ritchie
Saintfield, Northern Ireland - Queen's University, Belfast:History/Politics
Member of Dromara Reformed Presbyterian Church of Ireland (Covenanter)