The will of the Father is found in ALL that Jesus and the apostles passed on - Scripture and Tradition (see post 2508)
This is what the bible actually says about itself:
All Scripture is inspired by God.
It is to be used for doctrine; knowing what to believe.
Reproof; to express blame or disapproval against something that is in opposition to God's truth.
Correction; the action or process of correcting something in opposition to God's truth.
Instruction in righteousness; a direction or order that requires obedience in order to be in right standing with God.
That the man of God may be perfect; throughly furnished unto all good works.
"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 good works. " 2 Tim 3:16-17