There are at least three excellent reasons why other writings are not included and should not be included in the holy Scriptures, the Bible.

1. They are not truly inspired by God

Most importantly, other writings are not considered to be God-breathed. So they are not from God, they are from the minds of men. God did not move anybody by the Holy Spirit to write them. Therefore, they are truly not prophetic. For example, several books appeared between the period of both the Old and New Testaments. These have been grouped into what’s called the “Apocrypha” [meaning obscure or hidden books, that is, hidden or unseen by their absence, or uncommon use by God’s Covenant People, the Jews]. The Apocrypha has been widely disputed as to whether it is inspired or not. The Catholic Bible includes some of these books as part of their Old Testament. But most any other Bible does not, including strictly Jewish Old Testaments.

2. We have been given the final message

Resoundingly, in the first century A.D., the final message about Jesus Christ was already given to us, and to the world, once and for all. For example, “Contend earnestly for the faith which was once for all handed down to the saints” (Jude 3). Therefore, the good news about Jesus Christ, the gospel, is the only message for which we Christians should contend.

3. We have been sternly warned not to add words

Finally, warnings of the severest punishment await those who add to or take away from the previously established message of Christ. For example, Paul, an apostle of Christ, said, “I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel; which is really not another; only there are some who are disturbing you and want to distort the gospel of Christ. But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed! As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!” (Ga 1:6-9).

Note: As stated above, even “an angel from heaven” who brings “another” testament is cursed by the gospel. This would include the so called angel “Moroni”, after whom the Mormon church and book is named, and who brought, as their book title says, “Another Testament” of Jesus Christ to Joseph Smith.

Jesus said, “I testify to everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues which are written in this book and if anyone takes away from the words of the book of this prophecy, God will take away his part from the tree of life and from the holy city, which are written in this book” (Re 22:18, 19). So anyone who gets creative with the word of God or suppresses it will be condemned to the hellfire.