Belief After Doubt: Abraham’s Repentance Journey in Genesis 15

The Divine Continuality of History

• Belief After Doubt: Abraham’s Repentance Journey in Genesis 15

Faith often begins where our explanations fail. In Genesis 15, Abraham stands between God’s promise of a son and the reality that he still has no heir. What he sees does not seem to match what God has said.

In this moment, Abraham voices his questions, but he does not remain in them. He moves from reasoning about the situation to repenting of his wrong thinking to resting in what God declares. The passage shows how salvation works when we turn to God by abandoning our own explanation and trusting God’s way.

The pattern in Genesis 15 illustrates how a person comes to faith in Christ. Abraham first tried to explain God’s promise through his own reasoning, assuming that his servant Eliezer of Damascus would become his heir because he and Sarah had no child (Genesis 15:2–3). In the same way, people often begin with mistaken ideas about how God’s promises are fulfilled, relying on human solutions or their own understanding. This reliance on our own understanding cannot lead us forward; instead, true faith comes when we look beyond our own reasoning and trust in God’s promise.

God corrected Abraham’s assumption and declared that the heir would come from his own body (Genesis 15:4). When Abraham heard God’s word, he abandoned his earlier belief and trusted what God declared. He knew he was a sinner and had wrong thinking about how God’s promise could be fulfilled. This change of mind or heart reflects repentance since he turns away from his false idea and accepts God’s promise.

Abraham – Our Example

Genesis 15:6 then states that Abraham “believed the Lord, and He counted it to him as righteousness.” Abraham is called the father of faith because he believed in God before he was circumcised and long before the law (Romans 4). He is an example of how we all need to come to God, believing and not trusting in good works for salvation.

Likewise, coming to faith in Christ involves recognizing that our own explanations or efforts cannot bring salvation, turning from those mistaken ideas, and trusting in what God has declared through Christ. Just as Abraham was counted righteous because he believed God’s promise, a person is justified before God by trusting in God’s provision for salvation. God promised eternal life through the death, burial, and resurrection of Christ – this promise, rather than relying on one’s own understanding or good works.
Let’s analyze this passage to see the eternal principles of salvation.

We start with God’s Declaration (Genesis 15:1)

God begins by reassuring Abraham: “Do not fear, Abram, I am your shield; your reward shall be very great.” God had already promised Abraham descendants earlier (Genesis 12:2; 13:16), but time had passed, and the promise still seemed impossible. God, therefore, reaffirms His protection and blessing. Salvation always starts with God and his love. For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life (John 3:16, ESV). We know about God’s declarations, but often want to attempt to earn our way forward. God provided salvation for Abraham and he provides it for us.

So our first eternal principle is: Faith begins with God’s declaration, not human reasoning.

Abraham Reveals His Wrong Assumption (Genesis 15:2–3)

Abraham responds honestly:“O Lord God, what will you give me, for I continue childless, and the heir of my house is Eliezer of Damascus?” And Abram said, “Behold, you have given me no offspring, and a member of my household will be my heir.”
Since Abraham and Sarah had no child, Abraham had formed a logical solution: He proposed that his trusted servant, Eliezer of Damascus, could fulfill God’s promises by providing an heir in accordance with ancient household customs. Abraham, in his honest words, shows how we often misunderstand what we should do with God’s promises. He looked to human adoption and social human structures to bring fulfillment to having an heir, but this was not God’s way.

We are limited in our ability to fulfill God’s promises. We often try good works and religious rituals to save our souls or to gain God’s favor. There is nothing we can do to gain acceptance since we are sinners in need of a savior. Our actions cannot save us, nor can any other human figure.

Our parallel verse is from Galatians 2:16: Yet we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified. (ESV)

The eternal principle before us: No sinner can save themselves.

God Corrects Abraham’s Idea (Genesis 15:4)

God directly rejects Abraham’s assumption: “This man will not be your heir; but one who will come forth from your own body, he shall be your heir.” (NASB 1995) We need to hear these words – confronting our selfishness. This is not the way and your idea will not fulfill the promises of God. The promise will not come through Eliezer but through Abraham’s own body. These words also assume that God will not use the son of Hagar, Ismael. In Genesis 17:15-21, God explicitly states that Sarah is the mother of the promised son, Isaac, and again repeats this promise in Genesis 18:10, stating that God would make Sarah bear a son specifically in the coming year.

This moment makes Abraham realize how his own ideas and efforts differ from the way God promises to fulfill His word. He must recognize that trusting God’s promise means letting go of his own expectations and methods. He thought he knew a way to fulfill God’s promise. Like Abraham, some of us have a false idea about how we can work and attempt to gain God’s approval.

The principle of salvation is that God’s way is based on God’s method and not on human understanding.

God Strengthens the Promise Visually (Genesis 15:5)

God then gives Abraham a visual confirmation: And he brought him outside and said, “Look toward heaven, and number the stars, if you are able to number them.” Then he said to him, “So shall your offspring be.” Instead of explaining the mechanics, God magnifies the promise. The stars are an eternal reminder of God’s promises, grounded in His power. Likewise, in salvation, God blesses beyond our human understanding. How can we gain salvation or entrance into God’s presence – we can’t. Yet God blesses us in Christ when we look to believe in His way of salvation, meaning we can only trust in the work of Christ.

Principle: We can only trust in God’s promises – He provides, we believe.

Abraham Changes His Mind and Trusts God (Genesis 15:6)

This verse records Abraham’s repentance:“And he believed the Lord, and He counted it to him as righteousness.” This is the turning point, which we are familiar with, but we often ignore the repentance process presented in this text. Abraham thought one way but repented of that way. He turns his heart away from his grand idea, realizing that the focus of faith is still God’s promises. He had to humbly forget his “bright idea” and trust in God’s way.

So Abraham abandons his earlier desire (Eliezer as heir) and leans solely on God’s declaration. His faith is in God’s word, not his own efforts or ideas. The Hebrew idea of believing (’aman) means to rely on, to trust, to lean upon.
Abraham’s faith includes:

• Trusting God to accomplish it
• Admitting his earlier thinking was wrong.
• Turning from that assumption
• Accepting and believing God’s statement as true

That change of mind and heart reflects the essence of repentance, which starts with our inner thoughts that need to turn away from. Any external change is the fruit of this inner repentance.

The eternal principle of salvation includes repentance and trusting in God’s provision for deliverance.

God Declares Abraham Righteous

Because Abraham repented and trusted God’s word, God credited righteousness to him. Salvation is the same today. We repent of our sins and solely lean upon Christ’s provision for salvation. As a result, God makes us his child (John 1:12) and gives us acceptance.
This is crucial:
Abraham is not declared righteous because he produced the promise. Nor is he declared righteous because of his own ability to trust or endure by faith. He is declared righteous because he trusted the One who made the promise. The pattern becomes foundational for later biblical teaching about faith (Romans 4; Galatians 3).

The Faith Pattern in Genesis 15

The passage shows a clear spiritual progression:

1. God declares a promise
2. Abraham confesses his wrong desire
3. God corrects the misunderstanding
4. Abraham abandons his false idea
5. He believes what God declares
6. God credits righteousness to him

Core Lesson:
Faith forms when a person lets go of their own explanation and fully trusts what God declares, even when the promise seems impossible.