As Carl F. H. Henry suggests, revelation is "a divinely initiated activity, God's free communication by which he alone turns His personal privacy into a deliberate disclosure of his reality." In an act of holy graciousness, God gave up His comprehensive privacy that we might know Him. God's revelation is the radical claim upon which we dare to speak of God--He has spoken!

Our God-talk must therefore begin and end with what God has spoken concerning Himself. Preaching is not the business of speculating about God's nature, will, or ways, but is bearing witness to what God has spoken concerning Himself. Preaching does not consist of speculation but of exposition.

The preacher dares to speak the Word of truth to a generation which rejects the very notion of objective, public truth. This is not rooted in the preacher's arrogant claim to have discovered worldly wisdom or to have penetrated the secrets of the universe. To the contrary, the preacher dares to proclaim truth on the basis of God's sovereign self-disclosure. God has spoken, and He has commanded us to speak of Him.

The Bible bears witness to itself as the written Word of God. This springs from the fact that God has spoken. In the Old Testament alone, the phrases "the Lord said," "the Lord spoke," and "the word of the Lord came" appear at least 3,808 times. This confession brings the preacher face to face with Scripture as divine revelation. The authority of Scripture is none other than the authority of God Himself. As the Reformation formula testifies, "where Scripture speaks, God speaks." The authority of the preacher is intrinsically rooted in the authority of the Bible as the church's Book and the unblemished Word of God. Its total truthfulness is a witness to God's own holiness. We speak because God has spoken, and because he has given us His Word.

As Scripture itself records, God has called the church to speak of Him on the basis of his Word and deeds. All Christian preaching is biblical preaching. That formula is axiomatic. Those who preach from some other authority or text may speak with great effect and attractiveness, but they are preaching "another gospel," and their words will betray them. Christian preaching is not an easy task. Those who are called to preach bear a heavy duty. As Martin Luther confessed "If I could come down with a good conscience, I would rather be stretched out on a wheel and carry stones than preach one sermon." Speaking on the basis of what God has spoken is both arduous and glorious.

A theology of preaching begins with the confession that the God who speaks has ultimate claim upon us. He who spoke a word and brought a world into being created us from the dust. God has chosen enlivened dust--and all creation--to bear testimony to his glory.

In preaching, finite, frail, and fault-ridden human beings bear bold witness to the infinite, all-powerful, and perfect Lord. Such an endeavor would smack of unmitigated arrogance and over-reaching were it not for the fact that God Himself has set us to the task. In this light, preaching is not an act of arrogance, but of humility. True preaching is not an exhibition of the brilliance or intellect of the preacher, but an exposition of the wisdom and power of God.