“He promised the Spirit to guide His Church in all truth and it’s an unfolding revelation.”
“Therefore I testify to you this day that I am innocent of the blood of all, 27 for I did not shrink from declaring to you the whole counsel of God. 28 Pay careful attention to yourselves and to all the flock, in which the Holy Spirit has made you overseers, to care for the church of God, which he obtained with his own blood.” - Acts 20
“I did not shrink from declaring to you THE WHOLE COUNSEL of God.”
And yet books were written after that with deeper revelations… hmmm.