Today: [Isaiah 66] Book of Isaiah, Conclusion. In chapter 66 of Isaiah we re-examine the authorship and character of this all important and unique book of prophetic utterance. Isaiah is the first of the prophetic books and is uniquely messianic. In this concluding chapter, Isaiah speaks sternly against the ongoing idolatry of the people and the city of Jerusalem itself. As this book began denouncing idolatry among the people of God it concludes with the same adding a strong promise of hope to those who choose to walk in humility and contrition before the Father.