This threefold testimony is one and from the same Spirit. From Scripture, through the church, it penetrates the heart of the individual believer. Still, in each of these three forms, it has a meaning of its own. The testimony of the Holy Spirit in Scripture is “the primary motive toward faith or the principle by which, or the argument on account of which, Scripture become regulative (κανονικον) and non-apodictic (άναποδεικτον).” The testimony of the Holy Spirit in the church is “the other motive or instrument though which we believe. It is introductory (εισαγωγικον) and supportive (ύπουπγικον).” The witness of the Holy Spirit in the heart of the believer is the “efficient cause of faith, the principle by which or through which we believe. It is originating (άπχηγικον) and effecting (ένεργητικον).”
Given these distinctions, also the charge of circular reasoning usually advanced against the testimony of the Holy Spirit is invalidated. For, strictly speaking, the testimony of the Holy Spirit is not the final ground but the means of faith. The ground of faith is, and can only be, Scripture, or rather, the authority of God, which comes upon the believer materially in the content as well as formally in the witness of Scripture. Hence the ground of faith is identical with its content and cannot, as Herrman believes, be detached from it. Scripture as the word of God is simultaneously the material and the formal object of faith. But the testimony of the Holy Spirit is the “efficient cause,” “the principle by which,” of faith. We believe Scripture, not because of, but by means of the testimony of the Holy Spirit. Scripture and the testimony of the Holy Spirit relate to each other as object truth and subjective assurance, as the first principles and their self-evidence, as the light and the human eye. Once it has been recognized in its divinity, Scripture is incontrovertibly certain to the faith of the believing community, so that it is both the principle and the norm of faith and life.
~Herman Bavinck~
Reformed Dogmatics Vol. 1: Prolegomena (Grand Rapids, Michigan; Baker Academic; 2003) p. 597-598.
The Old Guys 
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