Chapter 5-6 of Isaiah, take us from a love song over an unfruitful vineyard to Isaiah's call from the Lord to talk to a disobedient people, who would not listen to Him. We learn about our faithful God who has given the Israelites everything they need to be fruitful, but because of their disobedience, God is sending them judgement instead. He cleary descibes His complaints against them, in the form of 6 woes. Finally, in chapter 6, Isaiah himself declares "Woe is me" and finds purification from sins, so that he is ready to be on mission for God.