5 In that day(of judgment on Ephriam) the Lord of hosts will be a crown of glory, and a diadem of beauty, to the remnant of his people,
6 and a spirit of justice to him who sits in judgment, and strength to those who turn back the battle at the gate.
Just as there will always be judgment for God's wayward people, there will always be a remnant of His people, crowned by the Lord of Glory, a diadem of beauty. The church has no glory but God, and no beauty but His holiness.
What of those who would fancify His glory and find beauty other than His? Theirs is a hopeless quest. He does not need or want great cathedrals, and the beauty of fine furnishings and art are to Him, ugliness.
9 “To whom will he teach knowledge,
and to whom will he explain the message?
Those who are weaned from the milk,
those taken from the breast?
10 For it is precept upon precept, precept upon precept, line upon line, line upon line, here a little, there a little.”
One can almost hear the prophet saying, "Does God have any volunteers?" If He can find them, they will have grown past the milk of the gospel. They will be teachable and patient, not having to know it all up front, but willing to accept any crumb of knowledge or wisdom that falls to them.