The Spirit of Truth

"The Spirit of truth . . . will not speak on His own authority, but whatever He hears He will speak, and He will declare to you the things that are to come."
JOHN 16:13
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The Spirit of Truth
Here Christ makes the Holy Spirit a Preacher. He does so to prevent one from gaping toward heaven in search of Him, as the fluttering spirits and enthusiasts do, and from divorcing Him from the oral Word or the ministry. One should know and learn that He will be in and with the Word, that it will guide us into all truth . . .. For I, too, am a half-baked theologian. This I say lest I exalt myself over the great minds who have long ago ascended into the clouds beyond all Scripture and have nestled under the wings of the Holy Spirit. But experience has taught me all too often that whenever the devil catches me outside Scripture and sees that my thoughts are rambling and that I, too, am fluttering toward heaven, he brings me to the point of not knowing where God is or where I am. The Holy Spirit wants this truth, which He is to impress into our hearts to be so firmly fixed that reason and all one's own thoughts and feelings are relegated to the background. He wants us to adhere solely to the Word and to regard it as the only truth. And through this Word alone He governs the Christian Church to the end.

From Sermons on the Gospel of John, Chapters 14-16 (Luther's Works 24:362)