The doctrine of the sufficiency of Scripture does not imply that God cannot add any more words to those he has already spoken to his people. It rather implies that man cannot add on his own initiative any words to those that God has already spoken. Furthermore, it implies that in fact God has not spoken to mankind any more words which he requires us to believe or obey other than those which we have now in the Bible.
This point is important, for it helps us to understand how God could tell his people that his words to them were sufficient at many different points in the history of redemption, and how he could nevertheless add to those words later. For example, in Deuteronomy 29:29 Moses says, "The secret things belong to the Lord our God; but the things that are revealed belong to us and to our children for ever, that we may do all the words of this law."
This verse reminds us that God has always taken the initiative in revealing things to us. He has decided what to reveal and what not to reveal. At each stage in redemptive history, the things that God had revealed were for his people for that time, and they were to study, believe, and obey those things. With further progress in the history of redemption, more of God's words were added, recording and interpreting that history (see chapter 3 above regarding the development of the canon).
Thus, at the time of the death of Moses, the first five books of our Old Testament were sufficient for God's people at that time. But God directed later authors to add more so that Scripture would be sufficient for believers in subsequent times. For Christians today, the words from God that we have in the Old and New Testaments together are sufficient for us during the church age. After the death, resurrection, and ascension of Christ, and the founding of the early church as recorded in the New Testament, and the assembling of the books of the New Testament canon, no further central redemptive acts of God in history (acts that have direct relevance for all God's people for all subsequent time) have occurred, and thus no further words of God have been given to record and interpret those acts for us.
This means that we can cite Scripture texts from throughout the canon to show that the principle of the sufficiency of God's revelation to his people at each particular time has remained the same. In this sense, these verses that talk about the sufficiency of Scripture in earlier periods are directly applicable to us as well, even though the extent of the Bible to which they refer in our situation is greater than the extent of the
Scripture to which they referred in their original setting. The following texts from Scripture thus apply to us also in that sense:
You shall not add to the word which I command you nor take from it; that you may keep the commandments of the Lord your God which I command you. (Deut. 4:2) Everything that I command you you shall be careful to do; you shall not add to it or take from it. (Deut. 12:32)
Every word of God proves true; he is a shield to those who take refuge in him. Do not add to his words lest he rebuke you, and you be found a liar. (Prov. 30:5-6) I warn everyone who hears the words of the prophecy of this book: if anyone adds to them God will add to him the plagues described in this book, and if anyone takes away from the words of the book of this prophecy, God will take away his share in the tree of life and in the holy city, which are described in this book. (Rev. 22:18-19)2
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