16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, thoroughly furnished unto all good works.
All scripture, the entire King James Bible is God inspired, God breathed and profitable for teaching men, for reprimanding, correcting wrong behaviour and unsound beliefs, and for instruction in righteousness. Why?
That saved people may be perfect, not only saved souls, but vessels of honour, completely and fully equipped unto all good works.
Since we have to rightly divide between Gospels as per 2 Timothy 2:15 and Ephesians 1:13, concerning all scripture, what doctrine (teachings) are applicable for us today as saved members of the Body of Christ?
1 Corinthians 11:1 ~ Be ye followers of me, even as I also am of Christ.
We look to the Apostle Paul for our doctrine today, and consider too who he was speaking to.