And wisdom and knowledge shall be - This verse contains evidently an address to Hezekiah, and asserts that his reign would be characterized by the prevalence of piety and knowledge. This chapter abounds in sudden transitions; and it accords with its general character that when Yahweh had been addressed Isaiah 33:5, there should then be a direct address to Hezekiah.
The stability - This word denotes firmness, steadiness, constancy; and means that in his times knowledge and the fear of the Lord would be settled on a firm foundation. The whole history of the virtuous reign of Hezekiah shows that this was fulfilled (see 2 Kings 18)
And strength of salvation - Or saving strength; that is, mighty or distinguished salvation. Thy times shah be distinguished for great reforms, and for the prevalence of the doctrines of salvation.
The fear of the Lord is his treasure - The principal riches of Hezekiah. His reign shall not be distinguished for wars and conquests, for commercial enterprise, or for external splendor, but for the prevalence of piety, and the fear of the Lord.