Sufficiency of Scripture

Well, its been some time but here's some thoughts on the next chapter - the Sufficiency of Scripture - which links to some of the discussions we have been having recently.

Grudem's defintion (page 127) is interesting - "...means that Scripture contained all the words of God he intended his people to have at each stage of redemptive history, and that it now contains all the words of God we need for salvation, for trusting him perfectly, and for obeying him perfectly" - in that it seems to exclude more of the daily "everyday" things of life.

He makes a useful comment on this in his footnote at the bottom of page 128 where he accepts that God does guide us subjectively (and points to scriptural references to back this up) but makes the point that this subjective guidance points to scriptural texts. He still seems to 'limit' this to moral commands or 'facts'.

I particularly like D3 (page 131) where he states that 'God does not require us to believe anything about himself or his redemptive work that is not found in scripture'. Its a good reminder that while other writings can often be very helpful, our definitive source is uniquely scripture itself.

The first paragraph of 133 reminds us of the importance to check the rules / traditions / practices of any particular Christian group (such as a church) against the actual teaching of scripture - again, a useful principle.

I do find it surprising that he doesn't address the topic of understanding God's will for our lives when the Bible doesn't particularly address it - for example in the area of what job one should do. There are clearly principles which apply - to do with morality and so forth - which might cause a scripturally-based Christian to decide against working for a cigarette company (for example) but are these types of questions to be answered from the Bible?
A pointer to Grudem's view on this may be found in his second question on page 135 where he talks about 'doctrinal' & 'moral' questions as though these are the scope of what he is talking about, or is this an unwarranted assumption?

So in the context of the above what does sufficiency really relate to?