Therefore shall the Lord, the Lord of Hosts, send among his fat ones, leanness; and under his glory he shall kindle a burning like the burning of a fire.
And the light of Israel shall be for a fire, and his Holy One for a flame, and shall burn and shall devour his thorns and his briers in one day;
And shall consume the glory of his forest, and of his fruitful field, both soul and body; and they shall be as when a standard-bearer fainteth.
And the rest of the trees of his forest shall be few, that a child may write them.
And it shall come to pass in that day, that the remnant of Israel, and such as are escaped of the house of Jacob, shall no more again stay upon him that smote them, but shall stay upon the Lord, the Holy One of Israel, in truth.
The remnant shall return, yea, even the remnant of Jacob, unto the mighty God.
For though thy people Israel be as the sand of the sea, yet a remnant of them shall return; the consumption decreed shall overflow with righteousness.
This passage reminds me of the passages in 1 Peter 4:17 and D&C 112:25:
For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God?
And upon my house shall it begin, and from my house shall it go forth, saith the Lord;
Ancient Israel, because of her pride, idolatry and complacency, came under judgment, often by the means of the wicked nations surrounding it before they in turn received a reckoning. But I do not think Isaiah’s words apply only to ancient Israel, and likewise Peter warns and we’re told in the latter-days that God’s judgment will fall upon us (“the house of God”) first. Mere membership of his kingdom will not spare us from this process; indeed it makes us more accountable. But God’s judgment also serves as a cleansing and a sifting process, and the remnant who are left will be far more faithful. The question, I guess, is how we respond to that process and which direction we are sifted in.