Here are John MacArthur’s ten reasons for preaching the word.
first the intro paragraph:
Faithfully preaching and teaching the Word must be the very heart of our ministry philosophy. Any other approach replaces the voice of God with human wisdom. Philosophy, politics, humor, psychology, homespun advice, and personal opinion can never accomplish what the Word of God does. Those things may be interesting, informative, entertaining, and sometimes even helpful—but they are not the business of the church. The preacher’s task is not to be a conduit for human wisdom; he is God’s voice to speak to the congregation. No human message comes with the stamp of divine authority—only the Word of God. How dare any preacher substitute another message?
then the list. Go over there to read the rest of them.
2. Because It Is the Good News of Salvation
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4. Because It Stands as the Authoritative Self-Revelation of God
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6. Because It Is the Means God Uses to Sanctify His People