14You, however, continue in the things you have learned and become convinced of, knowing from whom you have learned them,15and that from childhood you have known the sacred writings which are able to give you the wisdom that leads to salvation through faith which is in Christ Jesus.
16All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness;
17so that the man of God may be adequate, equipped for every good work.
Seems that the Bible states that it is inspired by God and is all you need to be equipped for teaching, righteousness, in fact every good work.
That passage says that the scripture is, of course, inspired and “profitable”; some translate that as “useful”. St. Paul did not say that the scripture is also sufficient. Indeed, the letter several times also mentions oral teaching, including in verse 14. In that context, it is clear that the scripture adds to other schooling, and this combination of tradition and scripture produces a fully equipped clergy.