The Spirit and the Word
I mentioned this principle on Sunday, but nothing like as beautifully as Calvin does here:
The Holy Spirit so inheres in his truth, which he expresses in Scripture, that only when its proper reverence and dignity are given to the Word does the Holy Spirit show forth his power…. For by a kind of mutual bond the Lord has joined together the certainty of his Word and of his Spirit so that the perfect religion of the Word may abide in our minds when the Spirit, who causes us to contemplate God’s face, shines; and that we in turn may embrace the Spirit with no fear of being deceived when we recognize him in his own image, namely, in the Word. So indeed it is. God did not bring forth his Word among men for the sake of a momentary display, intending at the coming of his Spirit to abolish it. Rather, he sent down the same Spirit by whose power he had dispensed the Word, to complete his work by the efficacious confirmation of the Word.
Calvin, Institutes, 1.9.3
via The Old Guys.