In the book of Isaiah, God was fed up with false religiosity of Israel. They went through the motions of worship, but in their hearts they worshipped idols. They did not truly love God and therefore they did not truly love there neighbors. Instead of being a light to the world, they were a blight to the Lord.
To preserve His glory and their good God had to completely uproot Israel and replant them. They had completely lost sight of His holiness! This is what He reminds them of in Isaiah 6.
Have we lost sight of this exalted view of God? Is God small to us? Are we trying to manipulate Him to achieve our ends, or are we being humbled by His glory and presenting ourselves to Him for His ends?
1 In the year of King Uzziah’s death I saw the Lord sitting on a throne, lofty and exalted, with the train of His robe filling the temple.
2 Seraphim stood above Him, each having six wings: with two he covered his face, and with two he covered his feet, and with two he flew.
3 And one called out to another and said,
“Holy, Holy, Holy, is the LORD of hosts,
The whole earth is full of His glory.”
4 And the foundations of the thresholds trembled at the voice of him who called out, while the temple was filling with smoke.
5 Then I said,
“Woe is me, for I am ruined!
Because I am a man of unclean lips,
And I live among a people of unclean lips;
For my eyes have seen the King, the LORD of hosts.”
6 Then one of the seraphim flew to me with a burning coal in his hand, which he had taken from the altar with tongs.
7 He touched my mouth with it and said, “Behold, this has touched your lips; and your iniquity is taken away and your sin is forgiven.”
8 Then I heard the voice of the Lord, saying, “Whom shall I send, and who will go for Us?” Then I said, “Here am I. Send me!”
New American Standard Bible : 1995 update. 1995 (Is 6:1–8). LaHabra, CA: The Lockman Foundation.