I said Scripture IS SUFFICIENT for Spiritual KNOWLEDGE.
Throughly furnished IS SUFFICIENT.
2 Tim 3:
[14] But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them;
[15] And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.
[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, throughly furnished unto all good works.