It says so, so it must be true?
What? So it must be false?
Or is it true because the "right people" said it is?
Is the Holy Spirit not the right person to claim the authenticity of the books He wrote through inspired men?
All the other books that claims inspiration, take a look at them because most of them you can find contradictions from books in the bible. Most of them aren't as alive, doesn't cut as deep, doesn't ring as true as Scripture itself.
There is something about Scripture that I didn't realize until I read the Qu'ran. The wholeness of it, the love of it, the accuracy of it, the history of it, the prophecies of it. No other God have made as many prophecies and fulfilled them as God of the bible and in fact, no other gods have made them because He is only one. He can be as specific as He wants because it always comes true. No other god have sent a son, a breathing male, to live on this earth--and to die for our sins and redeem us back to God, all the false gods ask you to "love me because you're meer mortals", our God says "Love me because I first loved you" and that message is threaded throughout all the books of the Holy Scripture. Not because man bound those Scriptures, but because they were first inspired by the very breathe of God so that they too speak as the Holy Spirit gives witness through the men who wrote it.
How that works, I don't know but history attest to it, eyewitnesses attest to it and for it to be as truthful as it is about the physical, I'm going to trust it with the spiritual. The children of Israel had the special blessings of being visited by Angels to recognize the truth of God, and the children who were in Egypt had the special blessings of being led by Moses who saw the face of God and was given God's status and commandments by God Himself. They had a leader in Joshua who gave them courage to continue fighting and trusting in God's promises, and history books after history books from Judges to Ester, the prophecies that rang true, and the wisdom that is found in the entire books. Then we come to the New Testament that records our Saviors life, true, we only get glimpses but we also get His words and yet we don't hear the crying of people in those times telling us that those books are false.
Now, you might be thinking well of course it's true, it was placed together by the council, but no, that's not what I mean. Those men who bound the Scriptures might have had the Holy Spirit guiding them and had criteria for which was considered inspired but those men had criteria but they couldn't make the books inspired or authentic. They had to choose which books were inspired, those books didn't become inspired because those men chose them. The books in the Old and New Testament are just as inspired before the criteria was set by these men because it was God who authenticated them, how He does it, no idea, but they ring true.