I have found it a little harder than I thought in Isaiah looking for the Impact moments on Christ. So much of the first five chapters is all about the punishment God was sending down on Israel and Judah. I cannot imagine being Isaiah and having to be the one writing these words telling the "chosen people of God" that their sin was going to lead them to devastation. It must have been heart wrenching for Isaiah, not to mention dangerous because of how much he would have been hated for it.
Yet, Isaiah 6 tells us of the "encounter" Isaiah had with the Lord and why he delivered these heart wrenching, gut busting messages.
Isaiah finds himself in a vision, in the Holy presence of God. Even in his vision, Isaiah could not bear the torture of sense of sin on his lips and the lips of his people. But in Gods mercy, he provides a painful solution to Isaiahs pain, seating his lips with a hot coal. It sounds like punishment, but to Isaiah it was like a soothing balm on his lips. Sin and holiness do not mix.