Isaiah announces God’s surprising plan of grace and glory for his rebellious people and, indeed, for the world. God had promised Abraham that through his descendants the world would be blessed (Gen. 12:1–3). God had promised David that his throne would lead the world into salvation (2 Sam. 7:12–16; Ps. 89:19–37). But by Isaiah’s time, the descendants of Abraham and many members of the dynasty of David no longer trusted the promises of God, aligning themselves instead with the promises—and the fears—of this false world. Judah’s unbelief in God during the pivotal events of Isaiah’s lifetime redirected their future away from blessing and toward judgment. At this historic turning point, Judah moved from independence under God’s power to subservience under pagan powers.
What, then, of God’s ancient promises? Is the gracious purpose of God defeated by Judah’s sin? Isaiah answers that question. After the prefatory chapters 1–5, his answer unfolds in chapters 6–27, and the rest of the book develops the serious but hopeful message of these chapters. Isaiah’s answer is that, although God must purify his people through judgment, he has an overruling purpose of grace, beginning with Isaiah himself (ch. 6), spreading to Judah (Isa. 7:1–9:7) and Israel (Isa. 9:8–11:16), and resulting in endless joy (Isa. 12:1–6). Even the nations of the world are taken into account (Isa. 13:1–27:13). The purpose of Isaiah, then, is to declare the good news that God will glorify himself through the renewed and increased glory of his people, which will attract the nations. The book of Isaiah is a vision of hope for sinners through the coming Messiah, promising for the “ransomed” people of God a new world where sin and sorrow will be forever forgotten (Isa. 35:10; 51:11).
Isaiah’s book envisions three historical settings (see chart, below):
- Chapters 1–39 are set against the background of Isaiah’s own times in the late eighth century B.C.;
- Chapters 40–55 assume the Jewish exiles in Babylon in the sixth century as their audience; and
- Chapters 56–66 take the returned exiles and subsequent generations of God’s people as their backdrop.
It would be a mistake, however, to suppose that the chapters have relevance only to their assumed audiences: the long-range prophecies of chapters 40–66, as already indicated, challenge all the people of Judah in Isaiah’s time to accept their role in a story that is headed to a glorious future and to live faithfully in that light (cf. Isa. 2:5, on the heels of Isa. 2:1–4). Further, the entire book, as canonical Scripture, addresses all the people of God until Christ returns.
First, in his own times, Isaiah prophesied “in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah” (Isa. 1:1). Called by God “in the year that King Uzziah died” (Isa. 6:1), his long ministry began in 740 B.C. The external threat of Isaiah’s day was the militant Assyrian Empire rising to power in the east. The question forced upon Judah by this threat was one of trust: in what will God’s people trust for salvation—in human strategies of self-rescue, or in prophetic promises of divine grace?
This question of what and whom to trust intensified on two occasions. The first occurred c. 735 B.C., during the reign of King Ahaz. Under pressure from Assyria, the northern kingdom of Israel formed a pact of mutual defense with Syria, and together these two kingdoms aimed to force Judah into alignment with them (ch. 7). But God could be trusted to stand by his commitment to defend the Davidic throne. Accordingly, Isaiah assured Ahaz of God’s saving purpose. But Ahaz refused God, preferring the power of Assyria, and negotiated for pagan protection (2 Kings 16:5–9). Thus Ahaz surrendered the sovereignty of the Davidic throne to a nation hostile to the kingdom of God, and achieved nothing in return. The coalition arrayed against Judah failed—Syria fell in 732 B.C. and Israel in 722, as God had said they would (Isa. 7:16; 8:4).
The second crisis occurred in 701 B.C., during the reign of Hezekiah. This time Assyria was the threat. As before, the temptation was to negotiate an alliance of defense with human powers, in this case with Egypt (Isa. 30:1–7; 31:1–3; 36:6). Judah chose the false refuge of human promises rather than to rest on the Lord’s “sure foundation” (Isa. 28:14–22). Assyria then set out to punish Judah for its pact with Egypt. Hezekiah tried to buy peace from the Assyrians (2 Kings 18:13–16), but they turned on him (Isa. 33:1). Under extreme pressure, Hezekiah finally put his trust in the Lord and found him to be powerfully faithful (chs. 36–37).
The eventual downfall of Judah was foreseen in Hezekiah’s unguarded openness to Babylonian influence (ch. 39). Isaiah discerned in Hezekiah’s enthusiasm for Babylon a future of captivity there for God’s people.
Second, Isaiah was enabled by God to address the Jewish captives far away in Babylon in the sixth century B.C. He announces a promise that God is coming with a world-changing display of his glory (Isa. 40:5). To prepare for his coming, the exiles must return to the Promised Land (Isa. 48:20). They must not be demoralized by the impressive but empty culture of idolatry in which they live (Isa. 41:21–24), nor should they resent God’s use of a pagan conqueror, Cyrus the Great, as their liberator from Babylon (Isa. 44:24–28). They must look by faith for a greater liberator still to come, the messianic “servant of the Lord” (see ESV Study Bible note on Isa. 42:1–9). He will bring justice to the nations (Isa. 42:1–4) and save his people from their ultimate captivity, the guilt of sin (Isa. 52:13–53:12). Since the faith of God’s people had already proven weak, God pledges that he alone will accomplish this, for his own glory (Isa. 48:9–11).
Third, Isaiah addressed the returned exiles and subsequent generations of God’s people with messages of challenge and hope, to keep their faith and obedience steady until God fulfills all his promises. Isaiah makes clear the spiritual and universal nature of God’s true people (Isa. 56:3–8; 66:18–23). He sees the final triumph of One who is “mighty to save” (Isa. 63:1). His prophetic eye looks beyond the fraudulence of this world, all the way forward to the eternal finality of God’s renewed people in a renewed cosmos (Isa. 65:17; 66:22). “Therefore let us be grateful for receiving a kingdom that cannot be shaken” (Heb. 12:28).
History of Salvation Summary
Isaiah shares with the rest of the OT a high view of the mission of Israel. God called Abraham and his family to be the vehicle by which he would bring to the whole world the blessing of knowing the true God (Gen. 12:1–3). The great tragedy of Israel was their repeated faithlessness, which hid the light from the Gentiles. God will not be thwarted, however, and in order to bless the Gentiles he will purify his people (Isa. 1:24–28) and from them raise up the heir of David.
Though Isaiah denounces hypocrisy, greed, and idolatry as offenses against God, he also foresees the Savior of offenders, the Lord Jesus Christ, who is God-with-us (Isa. 7:14), the child destined to rule forever (Isa. 9:6–7), the hope of the Davidic throne (Isa. 11:1), the glory of the Lord (Isa. 40:5), the suffering servant of the Lord (Isa. 42:1–9; 49:1–6; 50:4–9; 52:13–53:12), the anointed preacher of the gospel (Isa. 61:1–3), the bloodied victor over all evil (Isa. 63:1–6), and more. Isaiah is mentioned by name in the NT over 20 times and is quoted there extensively, for the message he preached is the very gospel of Jesus and the apostles.
Isaiah’s message makes an impact on every reader in one of two ways. Either this book will harden the reader’s pride against God (Isa. 6:9–10; 28:13; 29:11–12) or it will become to the contrite reader a feast of refreshment in God (Isa. 55:1–3; 57:15; 66:2). Through Isaiah’s vision the eyes of faith see their iniquity laid on Another (Isa. 53:6), they see a new Jerusalem of eternal gladness (Isa. 65:17–18), they see all humanity giving God the worship that is his due forever (Isa. 66:22–23), and that prophetic vision keeps their hope alive. As with the rest of the OT, these things were written “that through endurance and through the encouragement of the Scriptures we might have hope” (Rom. 15:4).