Chapter 6 Isaiah's Vision of God and His God-given Commission.
Having learned in Chapter s 1-5 of the doom approaching for Judah and Jerusalem we now learn of the credentials of the one who had declared that doom. And yet they are not just credentials, they rather explain how this man was able to see into the very heart of Israel. For in this chapter we learn of Isaiah's remarkable vision of God, a vision that seemingly came at the beginning of his ministry, and which is immediately followed by the commission which he received. In it He sees the exalted holiness of God, and becomes aware as never before of the One with Whom He is dealing. As a result of this he is made aware of his own utter sinfulness before Him, and of the utter sinfulness of the people. Then, on responding to God's call, he is commanded to go and witness to these very people, and to go on witnessing, even though they will not hear. Finally he is promised that after trials which will decimate their numbers, there will be further trials, until in the end a holy remnant, but only a holy remnant, will be preserved.
Thus this chapter explains to God's people why he has the right to speak as he does, and how it is that he can see their true state rather than the outward appearance that they confidently present to others. It will be followed by reference to specific historical incidents and will connect these with the general message that has gone before.