2 Timothy 3:16-17 "All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; 17 so that the man of God may be adequate, equipped for every good work."
Secondly, throughout the Bible on hundreds of occassions we find the phrase: "thus says the Lord" closely attached to the words of the prophets.
Thirdly, no other book or written document in the world functions in the unique capacity of final authority like the Bible. The Baptist Faith & Message 2000 defines in more precise terms what is meant by the Bible being called "the final authority of all faith, practice and life: "Therefore, all Scripture is totally true and trustworthy. It reveals the principles by which God judges us, and therefore is, and will remain to the end of the world, the true center of Christian union, and the supreme standard by which all human conduct, creeds, and religious opinions should be tried. All Scripture is a testimony to Christ, who is Himself the focus of divine revelation." The Bible is thus the only authority that is final. The question is: how is this the case? Does the Bible claim for itself such a designation?