What the WCF says about Scripture

6. 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.

7. 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.

For further study see:

1. WSC Q2: What rule hath God given to direct us how we may glorify and enjoy Him?
2. WSC Q3: What do the Scriptures principally teach?
3. WLC 2: How does it appear that there is a God?
4. WLC 3: What is the Word of God?
5. WLC 4: How does it appear that the Scriptures are the Word of God?
6. WLC 5: What do the Scriptures principally teach?
7. WLC 6: What do the Scriptures make known of God?