How do we know the doctrine of using Scripture is true?

The truth of Scripture as our authoritative guide is underscored in 2 Timothy 3:16-17, where Paul states that all Scripture is inspired by God and is profitable for teaching, reproof, correction, and training in righteousness. This affirmation of Scriptural authority is essential, as it equips the man of God for every good work. The reliability of doctrine is rooted in the belief of the Bible's divine inspiration, which assures us that it is not merely a collection of human thoughts but the very Word of God intended for our salvation and sanctification.