The Structure of Isaiah: One Book or Two?
Isaiah's 66 chapters divide naturally into two major sections: chapters 1-39, often called First Isaiah, address the Assyrian crisis of the 8th century BC and call Judah to repentance; chapters 40-66, often called Second Isaiah (or Deutero-Isaiah), shift dramatically in tone and address the future Babylonian exile and the great restoration that lies beyond it. Critical scholars have debated whether one author or multiple authors wrote the book; evangelical scholars argue for unified authorship, noting that the New Testament consistently attributes the whole book to Isaiah (John 12:38-41 cites both halves as Isaiah's). The Bible Project's video introduction addresses this debate fairly, showing how the two halves function as deliberate literary counterparts -- judgment answered by restoration, exile answered by new exodus. Whatever one's view of authorship, the canonical shape of Isaiah as a unified 66-chapter whole is theologically coherent and beautiful.
Core Themes: The Holy One of Israel, Judgment, and Restoration
Isaiah's most distinctive divine title is the Holy One of Israel -- used 25 times in Isaiah versus only 6 times in the rest of the entire Old Testament. This title captures the book's central tension: God's absolute moral holiness means he cannot overlook injustice (hence the judgment oracles of chapters 1-39), but his covenant faithfulness means he will not permanently abandon his people (hence the comfort oracles of chapters 40-55). The famous call vision of Isaiah 6 -- where the prophet sees the LORD high and exalted, surrounded by seraphim crying Holy, holy, holy -- establishes the character of the God who sends him. Isaiah 40-55 builds toward the servant songs: four poems (42:1-9, 49:1-13, 50:4-11, 52:13-53:12) describing a mysterious figure who suffers on behalf of others and through whose wounds healing comes. The Bible Project's thematic series on the servant songs is among the finest introductory material available on this subject.
Messianic Prophecies: Isaiah as the Fifth Gospel
Isaiah contains more Messianic prophecy than any other Old Testament book -- which is why the Church Fathers often called it the Fifth Gospel. Isaiah 7:14 predicts a virgin will give birth to Immanuel (God with us), quoted by Matthew at Jesus' birth (1:23). Isaiah 9:6-7 describes a child born who will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace, who will reign on David's throne forever. Isaiah 11 portrays a shoot from Jesse's stump on whom the Spirit of the LORD rests. Most stunning is Isaiah 53, written around 700 BC: he was pierced for our transgressions, crushed for our iniquities; the punishment that brought us peace was on him, and by his wounds we are healed (53:5). Philip the Evangelist uses Isaiah 53 to lead an Ethiopian eunuch to faith in Jesus (Acts 8:26-40) -- making it the first recorded evangelistic sermon in Acts. The Bible Project's three-part video series on Isaiah 40-66 provides an exceptional visual guide to these prophetic landmarks.
Using Bible Project Isaiah Resources: A Practical Guide
The Bible Project offers several overlapping resources for studying Isaiah. The two overview videos (Isaiah 1-39 and Isaiah 40-66) together run about 20 minutes and provide the best free visual introduction to the book's structure, themes, and literary design available anywhere. The Podcast series on Isaiah -- part of their Explore the Bible project -- runs to dozens of episodes discussing each section in depth, with Tim Mackie and Jon Collins modeling careful reading attentiveness. The Read Scripture app (companion to the videos) provides chapter annotations synchronized with the videos. For group study, the Bible Project Study Notes PDF offers discussion questions for each section. A recommended study sequence: watch both overview videos first for the architectural view, then read the book itself in a good translation (ESV, NIV, or NLT), pausing at key passages to consult the podcast episodes. This combination of visual overview, careful reading, and audio commentary produces one of the richest possible encounters with this extraordinary prophetic book.