"All
scripture is given by inspiration of God, and is profitable for
doctrine, for
reproof, for
correction, for
instruction in righteousness: That the man of God may be
perfect,
throughly furnished unto all g>ood works". (2 Timothy 3:16,17).
Sounds all-inclusive. Who would need to add to the Scriptures?
Really depends upon your definition of “add”.
Jesus said that those who worship God must do so with with “spirit and truth” (John 4:23,24), that it was necessary to to take in accurate or deep knowledge to gain life. (John 17:3), Paul said that those who approach God must believe that He is and becomes the rewarder of those earnestly seeking Him.
The Pharisees had the Scriptures and read them diligently but lacking God's spirit they couldn't understand them.
They didn't become the “men of God”.
So where is the “adding” in the above?