Isaiah 6 Meaning: The Holy King and the Sent Prophet
Isaiah 6 is about who speaks for God and on what basis. A man sees the exalted King, is made honest about his sin, has his guilt taken away at the altar, and only then says yes to being sent.
Hopes healing power
Jeremiah's prayer asks God to do the healing, not a technique to secure it. He brings his wounds honestly and leaves the outcome with the Lord he praises.