The Reformed doctrine of sola Scriptura, then, affirms that the Bible is the sole written authority for the faith and life of God’s people. We respect and submit to lesser ecclesiastical authority, but we are not bound by it absolutely as we are by biblical authority. This is the basis for the Reformation principle of semper reformanda, which indicates that reformation of the church is an ongoing process. We are always called to seek more and more to bring our faith and practice into conformity to the Word of God.
Sproul, R.C.; Grace Unknown: The Heart of Reformed Theology; Baker Books; Grand Rapids, MI; copyright 1997; p. 54