Shared ground
Isaiah 48:3–7 presents the LORD as the one who both announces events ahead of time and then brings them about. The text ties prediction and fulfillment together: the message “went out of my mouth,” was “shown,” and then the LORD acted and it “happened” (v. 3). This is used as evidence of control over history, not merely good forecasting.
The passage also gives a moral diagnosis of Israel: stubborn, resistant, and prone to reframe outcomes in self-justifying ways (vv. 4–5). The LORD says he announced earlier events in advance so they could not later credit idols (engraved or metal images) for what occurred (v. 5). That means prophecy here functions to block false explanations.
A second emphasis is that revelation is staged. Israel has already “heard” enough to recognize what is obvious and is pressed to “declare it” (v. 6). Then the LORD introduces “new” and “hidden” matters disclosed “from this time” (v. 6), described as intentionally not previously heard so no one can claim, “I knew them” (v. 7).
Where interpretation differs (only where needed)
What are the “former things”? Some read them as earlier prophetic announcements in Isaiah that have already begun to come true in the exile setting. Others broaden them to include older acts and promises across Israel’s story. Either way, the argument depends on the audience having enough past fulfillment to be held accountable for what they have “heard.”
What does “suddenly I did them” mean? Some take it mainly as speed and surprise to the audience. Others take it as decisiveness—when the LORD chooses to act, the event is not delayed by human plans or rival gods.
What are the “new…hidden things,” and what does “created now” mean? Some interpret “created now” as the events themselves being newly brought into reality (new historical acts). Others understand it as the announcement being new—newly revealed to the audience at this moment—while the events may still unfold shortly. The passage itself stresses “newness” to prevent the audience from claiming prior knowledge, whether about the plans or the outcomes.
Why the disagreement exists
The text speaks in broad categories (“former things,” “new things,” “created now”) without naming a specific event in these verses. That leaves interpreters weighing the immediate chapter context (late-exile setting and looming political change) against the wider book’s pattern of recalling earlier acts and promises. Also, “created now” can naturally describe either an event coming into being or a disclosure being newly given.
What this passage clearly contributes
Explicitly, the passage claims that the LORD’s prior announcements and their fulfillment are meant to prove his sovereignty and to eliminate idol-based explanations (vv. 3, 5). It also claims that Israel’s stubbornness is a reason the LORD used advance disclosure (vv. 4–5). By inference, the text frames true knowledge of history as dependent on the LORD’s self-disclosure: what Israel can rightly say about events is shaped by what God has already said and what he is now revealing (vv. 6–7).