Actually, God is the only authority necessary because He is always right and never makes mistakes. The Bible is His Word preserved in written form as a guide for Christians to follow.
While verse 16 states, “All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:”
verse 17 says, “That the man of God may be perfect, thoroughly furnished unto all good works.”
Christ established the Catholic Church and gave it authority.
The New Testament was written by the first Catholics, i.e the oral traditions of Christ written down by the Apostles. The Church came before the Bible.
The Bible which we have today (including the New Testament which Protestants accept) was compiled by the Catholic Church under the guidance of the Holy Spirit.
Tell us where in the Bible it says Bible only because your references to 2 Tim 3:16-17 do not say that.
A few comments from the link I have given below:
“All Scripture is Inspired”- 2 Tim. 3:16-17
2 Tim. 3:14 - Protestants usually use 2 Tim. 3:16-17 to prove that the Bible is the sole authority of God’s word. But examining these texts disproves their claim. Here, Paul appeals to apostolic tradition right before the Protestants’ often quoted verse 2 Tim. 3:16-17. Thus, there is an appeal to tradition before there is an appeal to the Scriptures, and Protestants generally ignore this fact.
2 Tim. 3:15 - Paul then appeals to the sacred writings of Scripture referring to the Old Testament Scriptures with which Timothy was raised (not the New Testament which was not even compiled at the time of Paul’s teaching). This verse also proves that one can come to faith in Jesus Christ without the New Testament.
2 Tim. 3:16 - this verse says that Scripture is “profitable” for every good work, but not exclusive. The word “profitable” is “ophelimos” in Greek. “Ophelimos” only means useful, which underscores that Scripture is not mandatory or exclusive. Protestants unbiblically argue that profitable means exclusive.
2 Tim. 3:16 - further, the verse “all Scripture” uses the words “pasa graphe” which actually means every (not all) Scripture. This means every passage of Scripture is useful. Thus, the erroneous Protestant reading of “pasa graphe” would mean every single passage of Scripture is exclusive. This would mean Christians could not only use “sola Matthew,” or “sola Mark,” but could rely on one single verse from a Gospel as the exclusive authority of God’s word. This, of course, is not true and even Protestants would agree. Also, “pasa graphe” cannot mean “all of Scripture” because there was no New Testament canon to which Paul could have been referring, unless Protestants argue that the New Testament is not being included by Paul.
2 Tim. 3:16 - also, these inspired Old Testament Scriptures Paul is referring to included the deuterocanonical books which the Protestants removed from the Bible 1,500 years later.
2 Tim. 3:17 - Paul’s reference to the “man of God” who may be complete refers to a clergyman, not a layman. It is an instruction to a bishop of the Church. So, although Protestants use it to prove their case, the passage is not even relevant to most of the faithful.
2 Tim. 3:17 - further, Paul’s use of the word “complete” for every good work is “artios” which simply means the clergy is “suitable” or “fit.” Also, artios does not describe the Scriptures, it describes the clergyman. So, Protestants cannot use this verse to argue the Scriptures are complete.
scripturecatholic.com/scripture_alone.html
