This idea of: ONLY the Bible is mans Authority is NOT scriptural! This teaching of "Bible ALONE" is a man made TRADITION; until the great De-Formation of the Christian Church it was unheard of, for the first 1700 years Church brought Jesus and salvation to the peoples, there were very few bibles!
Martin Luther introduced this tradition; his idea was to remove Church from his life!
Scriptures are clear: "Jesus gave his AUTHORITY to the Church to Teach all nations"!
Fact is... The Church came long before there were any bibles!
The Bible teaches that only inspired men have authority, and these men were equipped and compelled to inscribe such divine oracles to a permanent medium. Men moved by their own personal motivations or delusions, have corrupted Church precepts with their, easily recognizable, perversions of Christian dogma and doctrine.
i.e. Intercession of the saints, Mary's immaculate conception or assumption into heaven, indulgences, purgatory, penance, vicar of Christ, infallibility of a man, celibacy of the clergy, etc...
Man's tradition has caused more damage and defamation to Christ's Church than the Bible could ever have possibly done, even by the worst exegetes. The Bible was complete prior to the 2nd Century, and therefore, God superintended that His oracles were to be preserved and unadulterated until the return of Christ. The Bible is thus authoritative and sufficient.
2 Peter 1:19-21
19 We also have the prophetic message as something completely reliable, and you will do well to pay attention to it, as to a light shining in a dark place, until the day dawns and the morning star rises in your hearts. 20 Above all, you must understand that no prophecy of Scripture came about by the prophet’s own interpretation of things. 21 For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.
2 Timothy 3:14-17
14 But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it, 15 and how from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. 16 All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, 17 so that the servant of God may be thoroughly equipped for every good work.
2 Peter 3:15-16
15 Bear in mind that our Lord’s patience means salvation, just as our dear brother Paul also wrote you with the wisdom that God gave him. 16 He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.