Oz,
I don't think it is a subjective opinion at all as it was taken from what the Bible teaches about itself.
[
2Ti 3:15-17 KJV]
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.
When the above verses inform that Scripture is able to make wise unto salvation, it is also telling us at the same time, that the process by which to rightly divide it is (and must be) included within the Bible itself and can only be achieved by following the guidelines the Bible sets-forth for its own interpretation. If those guidelines are followed (by those to whom they were intended), the Word of Truth (the Bible,) the result will be rightly divided biblical doctrine. The Bible is fully self-contained. The guidelines I provided were taken directly from the Bible so their value cannot be questioned. Should anyone attempt to use any procedures that are not directly from the Bible (and solely from the Bible) to understand the Bible, they place themselves into great spiritual jeopardy. If you are saying we should trust something outside of it to teach us how to interpret and understand it, I would say you would make a very grave mistake - don't rely on man to add a level of wisdom to the Bible by thinking they are wiser. Many would-be biblical scholars fall into that trap - they think they know more about the Bible than the Bible does. The Bible cannot lie or mislead about itself.
Timothy 2:15 means we should find in the Bible, the spiritual meaning, not the earthly meaning, in order to understand the mysteries of the kingdom