That means we dig deep holes in our Bibles and become firmly convinced of a doctrinal position before we have read, unbiasedly, everything in Scripture that would modify our conclusions. All Scripture is profitable for doctrine. Therefore a continual, contextual reading of the whole Bible is an invaluable pursuit which I would liken to strip mining. As we read through the whole Bible, we encounter not only delightfully familiar green pastures whose content we absorb so easily but also tedious desert portions that seem to be filled with unimportant facts, unpronounceable names, and incomprehensible ceremonies. But in so doing, everything is kept in context, and every once in a while, even the desert places blossom like a rose, yielding fruits and flowers that produce spiritual revelation so key to understanding whatever else God is teaching us, which we would have otherwise missed.
All Scripture is profitable for reproof, correction and instruction in righteousness.
For some it is a difficult thing to commit oneself to the idea that everything God has said about everything is right. It certainly is not a sophisticated proposition. Science, after all, has come so far since the Scriptures were written. Surely, adaptation of the Scriptures to the knowledge modern science has supplied would be in order. The apostle Paul, as learned as he was, had no problem with that concept.