In the beginning, Satan attacked the authority of the word of God. God very clearly told Adam not to eat the fruit of the tree of the knowledge of good and evil (Gen. 2:17). Adam, through the instigation of the Satan, questioned Godâ€™s word and disobeyed the command. Through Adamâ€™s fall, all mankind is born under the bondage of Satan. But they think that they are free and able to decide for themselves the nature of truth (Gen. 3). Satan has no new devices. He continues to question the sole authority of Godâ€™s word. At the time of the Reformation, the Bible was unknown. The pope and the councils of the church were considered the sole authority, speaking the very words of God. It was considered heretical and worthy of death to possess a copy of the Bible in the common tongue. The Reformers, on the other hand, recognized that the only authority for faith and life were the writings of the Old and New Testaments. The attack on Godâ€™s word continues. The authority of men is elevated, whether in popes, celebrity preachers, scientists, or other experts. The Word of God is relegated to the background â€“ a mere collection of antiquated anecdotes and moral fables. Today, inner personal â€˜revelationsâ€™ and mystical feelings take the place of the study of Godâ€™s word. As Reformed Christians we reject all additions to the Bible, since it is in the Bible alone that we find all that is necessary for faith and life. In the days of Paul, there were many who had their own message. They taught that the Bible wasnâ€™t enough. To the words of the Bible, one could add popular philosophy, scientific discoveries, or newly discovered models of behavior to make people better. Paul wrote to Timothy not to be fooled by them. 2 Tim. 3:16-17 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, thoroughly furnished unto all good works. Everything that is necessary for a Christian to believe has been written in the Bible. It is sufficient and clear, and is to be believed as it is the very words of God Himself. Therefore, to find who God is and how He is to be worshiped we turn to the Bible alone. To find who we are and what we need to do we turn to the Bible alone. We do not turn to our inner voices, our feelings, or the opinions of famous preachers, psychologists, or scientists. We only need to study the Bible. God tells us all that we need to know in the Bible. The problem is that we are sinful and blind, and must have our eyes opened to see what is clearly there. To be reformed means that we change our thoughts and learn to think Godâ€™s thoughts after Him. Godâ€™s thoughts are revealed to us only in the Bible. (Romans 12:1-2). We reject all those who teach that God must change His thoughts to match ours.
From the Belgic Confession, Article VII The Sufficiency of the Holy Scriptures to Be the Only Rule of Faith We believe that those Holy Scriptures fully contain the will of God, and that whatsoever man ought to believe unto salvation is sufficiently taught therein. For since the whole manner of worship which God requires of us is written in them at large, it is unlawful for any one, though an apostle, to teach otherwise than we are now taught in the Holy Scriptures: nay, though it were an angel from heaven, as the apostle Paul says. For since it is forbidden to add unto or take away anything from the Word of God, it does thereby evidently appear that the doctrine thereof is most perfect and complete in all respects. Neither may we consider any writings of men, however holy these men may have been, of equal value with those divine Scriptures, nor ought we to consider custom, or the great multitude, or antiquity, or succession of times and persons, or councils, decrees or statutes, as of equal value with the truth of God, since the truth is above all; for all men are of themselves liars, and more vain than vanity itself. Therefore we reject with all our hearts whatsoever does not agree with this infallible rule, as the apostles have taught us, saying, Prove the spirits, whether they are of God. Likewise: If any one cometh unto you, and bringeth not this teaching, receive him not into your house.