Background for Isaiah 43:18-19 and God’s promised new act

Isaiah 43 sits within a section of the book often called “Second Isaiah,” written to God’s covenant people facing a terrifying reality: exile and displacement. After judgment came into history, the question on many hearts would have been, “Is God finished with us?” The chapter answers by presenting God as the sovereign Redeemer who does not merely patch up the past, but announces a future deliverance.

In Isaiah’s day, public crises—wars, loss of land, and captivity—could make earlier promises feel distant. Yet God addresses this temptation directly: He tells His people not to cling to what once happened as their only interpretive lens. Instead, He calls them to recognize that His purposes move forward.

Isaiah 43:18-19, in particular, offers hope in a vivid way. The language of wilderness and desert would have resonated because it describes the absence of safety, water, and predictable routes. But God declares that He will act in precisely those “impossible” places—making a way and providing rivers. Historically, this aligns with the expectation that God would restore His people and make a path for return and renewal.

So the message is both theological and pastoral: God is faithful, not trapped by history, and able to create new realities for those who trust Him.

1) Remember differently: letting go of the past without denying God’s history

The opening instruction—“Remember ye not the former things, neither consider the things of old”—can sound, at first, like God is commanding believers to forget. But Scripture rarely treats the past as disposable. The Bible repeatedly calls God’s people to remember His mighty deeds (especially in worship), to learn from earlier judgments and mercies, and to rehearse truth.

So what is God rejecting here? He is rejecting the habit of using the past as a ceiling on hope. When life becomes painful, people often begin to interpret the future only through prior disappointments. Exile had become “old” news; the loss of stability felt permanent. God’s word confronts that emotional and spiritual pattern. He is saying: stop letting past pain define the limits of what God can do.

In an age of constant replay—replaying failures, repeating regrets, or rehashing old arguments—God’s call remains piercing. The instruction is not to deny earlier experiences, but to refuse to treat them as final. The past can teach, but it must not become a prison.

This also highlights God’s pedagogy. He does not begin with “I will explain,” but with “I will do.” His people need a fresh revelation of His character: He is able to move beyond what seems explainable from human perspective. The prophetic command, therefore, is a form of spiritual formation: God is shaping how His people will interpret present events.

That is why the next verse immediately turns to God’s action: “Behold, I will do a new thing.” The command to remember differently is preparatory. It clears the mind to see what God is about to reveal.

2) “Behold, I will do a new thing”: divine initiative that springs forth

After the command not to dwell on former things, God issues a dramatic announcement: “Behold, I will do a new thing; now it shall spring forth.” Prophets often speak in a “now” rhythm, signaling that God’s work is not only future in timeline but present in intention. The word “spring forth” suggests growth that cannot be stopped once it begins—like a seed pushing through soil.

This matters because many people can believe in God’s general promises while still concluding that those promises have expired for them personally. The prophet dismantles that conclusion. God declares His initiative as immediate and visible.

In Christian terms, this “new thing” can be understood in multiple layers. Historically, it points toward deliverance and restoration for God’s exiled people. Spiritually, it demonstrates that God’s covenant love does not change when circumstances change. He is not a God of delayed regret; He is the God who breaks patterns.

The phrase “shall ye not know it?” adds another layer. God expects recognition. His new work is not hidden behind mystery that only experts can decipher; it is meant to be perceived by those whose hearts are aligned with His truth. In other words, spiritual blindness is not primarily an intellectual problem—it is often a posture problem. If you insist that the past must control your expectations, you will struggle to see God’s new activity.

Therefore, this passage encourages believers to cultivate a watchful faith. Faith is not passive; it’s the active practice of looking for God’s movement and agreeing with His promises. “Behold” is an invitation to attention.

God’s “new thing” is both gift and challenge: a gift because God initiates; a challenge because we must be willing to notice and trust.

3) Wilderness and desert: where God makes a way and supplies rivers

The final lines present the new thing with striking imagery: “I will even make a way in the wilderness, and rivers in the desert.” A wilderness implies scarcity, danger, and disorientation. A desert implies dryness, exhaustion, and the fear that life has run out of resources.

By pairing “way” with “wilderness,” God addresses human uncertainty—how to move forward when you can’t see a path. By pairing “rivers” with “desert,” God addresses human need—how to continue when water seems absent. Together, the images portray complete provision: guidance for the journey and life for the traveler.

This is not only physical. Prophets frequently use geographic realities to describe spiritual experiences. Many believers go through seasons that feel like wilderness: unanswered prayers, job loss, relational breakdowns, grief that doesn’t fade, or spiritual dryness that makes worship feel distant. In those seasons, the temptation is to conclude that God has withdrawn.

Isaiah 43:19 replies with a different worldview. God’s ability is not limited by environmental constraints. The “wilderness” is precisely the setting where God creates a way. The “desert” is precisely where God sends rivers.

In practical devotional terms, this encourages hope without denial. A person can be in a wilderness and still receive a way from God. One can be thirsty and still receive rivers, whether through comfort, wisdom, provision, or renewed spiritual strength. The passage teaches that God’s new work may not always arrive as immediate comfort, but it can arrive as direction, endurance, and unexpected life.

It also speaks to timing. God says “now it shall spring forth.” That suggests action in seasons when people least expect it. Divine intervention is often less like a slow improvement and more like a sudden opening—like water showing up in dry ground.

Therefore, Isaiah 43:18-19 becomes a lens for trust: God can create pathways where there is no human plan and can produce life where there is no natural supply.

4) How to “know it”: faith that recognizes God’s present work

The rhetorical question “shall ye not know it?” implies responsibility. God does not only perform; He invites perception. This is important because many people pray for God’s intervention while remaining emotionally and spiritually unprepared to recognize it.

Knowing God’s work may look different than expected. Sometimes the “new thing” comes as a change in circumstances. Other times it comes as a change in us: a renewed conscience, restored courage, repentance that turns the heart, or humility that makes room for God to act. God’s new work can be external and internal.

Yet the passage also suggests that recognition depends on attitude. “Remember ye not the former things” is a call to release the past from its throne in your mind. If the former things dominate your thinking, you will interpret present events through a lens of hopelessness. You will expect disappointment, and that expectation can subtly block faith.

Conversely, when we treat God’s promises as living realities, we begin to notice patterns of grace. We see how God provides, redirects, strengthens, or opens doors. The passage therefore calls for spiritual attentiveness.

In Christian devotion, this attention often takes the form of prayer, Scripture meditation, and reflection on God’s character. It means asking, “Where is God making a way? Where is He bringing rivers of provision? What new growth is springing forth right now?”

Notice also that God’s question is addressed to a community, not only to individuals. This suggests that God’s new work can be witnessed together—through testimonies, shared worship, and collective discernment. Community helps people avoid isolation-driven misinterpretation.

Ultimately, Isaiah 43:18-19 teaches that God’s newness is not random. It is covenantal, intentional, and purposeful—so that believers may live forward with confidence.

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