Isaiah 33
v.6
He will be the sure foundation for your times, a rich store of salvation and wisdom and knowledge; the fear of the Lord is the key to this treasure.
The major issue in recent chapters (esp. chs. 30-31) has been political security. If the Assyrian officers were below the city walls at the time of this oracle, with all hope of relief from Egypt gone, the words of the prophet are particularly significant. That a “rich store of salvation and wisdom and knowledge” is in apposition to “the sure foundation” shows that to the prophet the Lord was all the people needed (cf. 1Co 1:30; Col 2:2-3). The Lord himself was more than enough to give them protection from their enemies and wisdom in living as his people in the world.
The assertion that this “rich store” becomes available through the fear of the Lord reminds us of the association of “the fear of the Lord” with the messianic King (11:2-3). The word “fear” may also have been chosen because of the historical situation. The people trusted Egypt and feared Assyria; in fact, God was to be their fear just as the reference to a sure foundation suggests that he too should be their trust.