That chap at Waco didn't God speak to him? You know, the guy who had sex with 10 yr olds. He even convinced the men to be celibate, while he fathered children with their wives and their children
outoftheorg, (N/C for sp correction.)
Is what this guy did similar to the teachings of Jesus or how Jesus lived his life?
Saint Satan, if people were not out for themselves and wanting to glorify themselves rather than God, God should only have to speak to one person or a select few. If men didn't lie, there would be no doubt that God spoke to these men. The fact that we can't trust others proves the futility of trusting in men rather than trusting in God.
He never commanded that a book be combined and added to the old Testemant for the rest of the world to live by.
The Revelation quote was Jesus commanding John to write to the churches the events of the future. It is not written where God told people to write the New Testament but here is something else to look at.
John 16:12-15 King James Version
I have yet many things to say unto you, but ye cannot bear them now.  Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.  He shall glorify me: for he shall receive of mine, and shall shew it unto you.  All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you.
Why would the Holy Spirit reveal (shew) the truth to people but not have the people tell others about what the Holy Spirit said?
Folks are wise to require convincing evidence of a claim before believing it.
The Israelites thought the same thing.
And if thou say in thine heart, How shall we know the word which the Lord hath not spoken?  When a prophet speaketh in the name of the Lord, if the thing follow not, nor come to pass, that is the thing which the Lord hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.
So how were some books included and others excluded from the Old Testament? One of the quickest way for someone's writings to be excluded is when a person said or wrote of a prophesy that did not happen the way he said. The writers of the Old Testament usually wrote of near term prophesy as well as distant prophesy. If the near term prophesy didn't come true, the writings were excluded. The penalty for being a false prophet was death.
If you disagree with most scholars as the dates of the books of the Old Testament so they were written after the "supposed" prophesy took place, than in my mind, there is no way for you to distinguish truth from error in which books are "inspired" by God. As far as I know, Christianity is the only religion where the writings to be followed contain prophesy. I know the Koran doesn't contain any except the self fulfilling one.