SCOTS CONFESSION, Ch. XVIII (3.18):
The interpretation of Scripture, we confess, does not belong to any private or public person, not yet to any Kirk for pre-eminence or precedence, personal or local, which it has above others, but pertains to the Spirit of God by whom the Scriptures were written. When controversy arises about the right understanding of any passage or sentence of Scripture, or for the reformation of any abuse within the Kirk of God, we ought not so much to ask what men have said or done before us, as what the Holy Ghost uniformly speaks within the body of the Scriptures and what Christ Jesus himself did and commanded . . . So if the interpretation or opinion of any theologian, Kirk or council is contrary to the plain Word of God written in any other passage of the Scripture, it is most certain that this is not the true understanding and meaning of the Holy Ghost. . . . We dare not receive or admit any interpretation which is contrary to any principal point of our faith, or to any other plain text of Scripture, or to the rule of love.

SECOND HELVETIC CONFESSION, Ch. II:
5.010: But we hold that interpretation of the Scripture to be orthodox and genuine which is gleaned from the Scriptures themselves (from the nature of the language in which they were written, likewise according to the circumstances in which they were set down, and expounded in the light of like and unlike passages and of many and clearer passages) and which agrees with the rule of faith and life, and contributes much to the glory of God and man's salvation.

5.011. Wherefore we do not despise the interpretations of the holy Greek and Latin fathers, nor reject their disputations and treatises concerning sacred matters as far as they agree with the Scriptures; but we modestly dissent from them when they are found to set down things differing from, or altogether contrary to, the Scriptures. Neither do we think that we do them any wrong in this matter; seeing that they all, with one consent, will not have their writings equated with the canonical Scriptures, but command us to prove how far they agree or disagree with them, and to accept what is in agreement and to reject what is in disagreement.

WESTMINSTER CONFESSION, Ch. I, paragraphs 4,6,7, 9, and 10:
6.004. The authority of the Holy Scripture, for which it ought to be believed and obeyed, dependeth not upon the testimony of any man or church, but wholly upon God (who is truth itself), the author thereof; and therefore it is to be received, because it is the Word of God.

6.006. The whole counsel of God, concerning all things necessary for his own glory, man's salvation, faith, and life, is either expressly set down in Scripture, or by good and necessary consequence may be deduced from Scripture: unto which nothing at any time is to be added, whether by new revelations of the Spirit, or traditions of men. Nevertheless we acknowledge the inward illumination of the Spirit of God to be necessary for the saving understanding of such things as are revealed in the Word; and that there are some circumstances concerning the worship of God, and government of the Church, common to human actions and societies, which are to be ordered by the light of nature and Christian prudence, according to the general rules of the Word, which are always to be observed.

6.007. All things in Scripture are not alike plain in themselves, nor alike clear unto all; yet those things which are necessary to be known, believed, and observed, for salvation, are so clearly propounded and opened in some place of Scripture or other, that not only the learned, but the unlearned, in a due use of the ordinary means, may attain unto a sufficient understanding of them.

6.009. The infallible rule of interpretation of Scripture is the Scripture itself; and therefore, when there is a question about the true and full sense of any scripture (which is not manifold, but one), it may be searched and known by other places that speak more clearly.

6.010. The Supreme Judge, by which all controversies of religion are to be determined, and all decrees of councils, opinions of ancient writers, doctrines of men, and private spirits, are to be examined, and in whose sentence we are to rest, can be no other but the Holy Spirit speaking in the Scripture.

SHORTER CATECHISM, 7.090:
Q. 90: How is the Word to be read and heard, that it may become effectual to salvation?
A: That the Word may become effectual to salvation, we must attend thereunto with diligence, preparation, and prayer; receive it with faith and love; lay it up in our hearts; and practice it in our lives.

DECLARATION OF BARMEN, 8.11:
Jesus Christ as he is attested for us in Holy Scripture is the one Word of God we have to hear and which we have to trust and obey in life and in death.