The Book of Isaiah holds significant relevance in understanding key moments and themes related to God's purpose and timing, particularly in connection with the year of release and the Jubilee. Isaiah 34:8 speaks of the year of recompense for the cause of Zion, and Isaiah 63:4 declares the year of God's redeemed, both pointing to a specific period culminating in Christ's return, likely ending in the fall. These references highlight a secondary year outside the sacred calendar, emphasizing God's redemptive plan. Furthermore, Isaiah's prophecies are central to the account of Jesus Christ's ministry as recorded in Luke 4. Christ read from Isaiah 61, proclaiming liberty and the acceptable year of the Lord, directly linking to the Jubilee concept of Leviticus 25, where liberty is announced on the Day of Atonement. He also incorporated elements from Isaiah 42, a Messianic prophecy about bringing justice and light to the Gentiles, and Isaiah 58, which relates to the Jubilee themes of releasing oppression and breaking heavy burdens. These selections underscore a divine reset and liberation beyond the year of release, pointing to a comprehensive freedom from all forms of bondage through the Messiah. The timing of Christ's ministry, potentially beginning in the fall of 27 AD during a Jubilee year following a year of release in 26-27 AD, aligns with the themes in Isaiah. This positioning suggests His 3½-year ministry started in a year of new beginnings, resonating with the Jubilee's significance as both the 50th year and the first of a new cycle, mirroring the profound renewal and liberty proclaimed in Isaiah's words.

The Book of Isaiah, particularly chapters 24 through 27, known as Isaiah's Apocalypse, addresses the world at large during the Day of the Lord and its aftermath. Isaiah 24 depicts a desolate earth, emptied and plundered, with few survivors left amidst ceased mirth and a broken city of confusion. In this context, God preserves remnants, likened to olives and grapes left after harvest, representing both spiritual and physical survivors who sing praises to Him from the ends of the earth. The chapter culminates with Christ reigning gloriously in Jerusalem and Zion, His brilliance outshining the sun and moon, seated before the elders. Isaiah 25 shifts to a tone of praise, reflecting on God's faithful works and the comprehensive destruction of the world-city of ruthless nations, never to be rebuilt. It highlights two thematic links with the preceding chapter: the worldwide scope of Christ's work before and after His return, and Zion as the pivotal geographic point from which He rules. References to "on this mountain" underscore Mount Zion in Jerusalem as the center of His reign. The chapter progresses through time, from the destruction of the terrible ones' city to a future where God swallows up death forever, wiping tears from all faces. It also notes Christ's ongoing work among the Gentiles, initiated and supervised from Zion, emphasizing a worldwide reconciliation emanating from Israel. Isaiah 26 continues the theme of praise with a song of the remnant, particularly those in or near Jerusalem, upon Christ's return. The song, linked thematically to the Song of Moses, celebrates God as the Rock of ages, with elements of salvation, deliverance, and eternity. It contrasts the city of God with the doomed city of man, depicting God's ongoing judgment through the Millennium and beyond. The chapter includes reflections on lessons learned under Christ's rule, such as the path of the righteous being made straight, the incorrigibility of some wicked individuals even in a righteous environment, and the recognition that all achievements are accomplished by God's power. It concludes with counsel for God's people across time to remain hidden in Him, enduring until He rouses Himself to action, resurrecting the faithful and punishing evildoers. Isaiah 27 concludes Isaiah's Apocalypse with the Lord reigning in the holy mount at Jerusalem, reinforcing the centrality of Zion as the base for Christ's worldwide work of reconciliation and regathering of Israel. Throughout these chapters, the prophet moves fluidly through time, reflecting God's perspective unbound by linear constraints, emphasizing that in every timeframe, Christ leads from Zion, working salvation for His people.

The Book of Isaiah contains a significant prophecy spanning chapters 24 through 27, often referred to as Isaiah's apocalypse. This continuous prophecy focuses on the Day of the Lord, impacting the entire earth rather than specific nations, distinguishing it from other prophecies in Isaiah that target particular regions such as Assyria, Moab, Ethiopia, Egypt, Tyre, and Babylon. In Isaiah's apocalypse, the terms earth, world, or land appear frequently, emphasizing a global scope, with these nouns mentioned 34 times across the four chapters and 20 times in chapter 24 alone. A key theme in Isaiah's apocalypse is the universal impact of God's judgment, affecting everyone everywhere. The prophecy highlights God's punishment of both heavenly beings and earthly kings during the Day of the Lord, underscoring His wrath across the whole face of the earth. Additionally, the concept of "city" is prominent, appearing 54 times throughout Isaiah, with nine instances in these apocalyptic chapters. The term city, often linked with land, represents a broader world-city, symbolizing anti-God civilization under satan's influence, which faces everlasting ruin at God's hand. This connection between city and earth is reinforced as both share a destiny of eternal destruction. Isaiah's apocalypse also features a strong emphasis on singing and songs, with the Hebrew verbs and nouns for singing used 35 times in the book, more than in all other prophetic writings combined. This singing, associated with God's people, contrasts sharply with the despair of the godless during the Day of the Lord, reflecting the joy of the saved amidst devastation. The prophecy further introduces two remnants, metaphorically described as grape gleanings and olives, representing groups preserved by God through widespread destruction. These remnants, dispersed worldwide, will sing and shout in praise of God from the ends of the earth, glorifying Him as a witness to all nations.

During the reign of Uzziah, king of Judah, God raised up the prophet Isaiah to warn Judah of its spiritual condition. Uzziah's death is noted in Isaiah 6:1, and the first five chapters of the Book of Isaiah specifically address Judah during his reign. Isaiah describes the nation as utterly corrupt, stating that from the sole of the foot even to the head, there is no soundness in it, but wounds and bruises and putrefying sores; they have not been closed or bound up, or soothed with ointment. This vivid imagery reflects the deep moral and spiritual decay prevalent in Judah under Uzziah's leadership, highlighting the pervasive influence of idolatry and disobedience among the people.

Isaiah stands at the pinnacle of Old Testament prophecy, with his book being the longest prophetic work and highly acclaimed for its literary genius. His ministry apparently began in the year King Uzziah of Judah died, around 740 BC, and extended through the reigns of Jotham, Ahaz, and Hezekiah, continuing until sometime after the death of King Sennacherib of Assyria in 681 BC. Isaiah's prophecy of Cyrus, king of Persia, is particularly striking, as he is specifically named as the deliverer of the Jews, demonstrating God's precise intervention in human events. Additionally, God's declaration in Isaiah 14:25-27 underscores His unassailable authority, affirming that no plan or purpose can stand against His will, highlighting His sovereignty over all nations and events.