When a believer examines the Scriptures, he might discover something in it's pages that is different from what he had always believed to be true. When the Bible proves me wrong about something I have believed, it is my duty to change my belief, bringing it into conformity with the Scriptures. The bible calls that "correction:"

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All Scripture is God-breathed, and is profitable for teaching, for reproof, for correction, for training in righteousness; so that the man of God may be adequate, equipped for every good work (2nd Timothy 3:16-17, NASB).

The duty of every believer is to be "always reforming," always subjecting himself to the word of God, always ready to repent of false belief and vain practice.