2 Timothy 3:16-17 New King James Version (NKJV)

¹⁶ All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, ¹⁷ that the man of God may be complete, thoroughly equipped for every good work.

Quote by Augustine

“Among those things which are said openly in Scripture are to be found all those teachings which involve faith, the mores of living, and that hope and charity which we have discussed.” – Augustine, On Christian Doctrine trans. by D.W. Roberston, Jr. (New York: Liberal Arts Press, 1958) 11:9.

Quote by John Wesley

“The Church is to be judged by the Scriptures, not the Scriptures by the Church.” – John Wesley

Westminster Confession of Faith

“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.”

Quote by John Gill

“The scriptures are the only external guide in matters of religion; they are the way-posts we should look up unto, and take our direction from, and should steer our course accordingly: To the law and to the testimony: if men speak not according to this word, it is because there is no light in them (Isa. 8:20); we should not believe every spirit, but try them, whether they are of God (1 John 4:1); and the trial should be made according to the word of God; the scriptures should be searched, as they were by the noble Bereans, to see whether the things delivered to consideration are so or no; the inscriptions on these way-posts should be read, which are written so plain, that he that runs may read them; and they direct to a way, in which men, though fools, shall not err” 

John Gill, “The Scriptures the Only Guide in Matters of Religion”