Isaiah 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Well DHK, by that logic the sole authority regarding faith and morals for Christians comes only from the Old Testament (Specifically Isaiah 8) as the New Testament was not even around. Care to try again?
I only gave you one verse. It was from the OT. The principle it teaches is still applicable. However, consider:
Jesus said:
John 5:39 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
--The Scriptures are our sole authority, thus the command to search them; not the books that are written about Christ.
Acts 17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
--They searched the Scriptures instead of taking Paul's message at face value. The used the OT to validate a NT message. Paul calls them noble for doing so.
2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
--All Scripture is inspired. No Catholic Catechism, Book of Mormon, Oral Tradition, Writings from the ECF or any other sacred writing is inspired. The Scriptures only are inspired. They only are our sole authority. God inspired them.
2 Peter 1:20-21 Knowing this first, that no prophecy of the scripture is of any private interpretation.
21 For the prophecy came not in old time by the will of man: but
holy men of God spake as they were moved by the Holy Ghost.
--Those holy men of God were the prophets of the OT and the Apostles of the NT. They spoke as they were moved by the Holy Spirit. What was written were the very words of God. We have the Scriptures today. They are our sole authority.
2 Timothy 2:15 Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.
--It is the Scriptures that we are commanded to study; not any other book. Why? Because it is the Scriptures that are our only authority.