Hagar and Sarah, Understanding the Two Covenants | Galatians 4:21-27 ESV

There are moments in Scripture when God uses a familiar story to open the eyes of His people in a fresh way. Galatians 4:21-27 is one of those moments. Paul draws on the story of Abraham, Hagar, and Sarah to give the Galatians a clear picture of the difference between living under the law and living under the promise. It is a bold and unexpected comparison, yet it reveals the heart of the gospel with striking clarity.

The Galatians were tempted to embrace the law as their primary path to spiritual maturity. Paul shows them that choosing the law is like choosing slavery when freedom has already been offered. Through this illustration, he helps them see that believers are children of promise, not children of human effort.

This passage invites believers today to consider what they are relying on, their own strength or God’s promise. Paul’s words call the heart back to grace, reminding us that life with God is not built on striving but on trusting the One who made and keeps His promises.

Tell me, you who desire to be under the law, do you not listen to the law. For it is written that Abraham had two sons, one by a slave woman and one by a free woman. But the son of the slave was born according to the flesh, while the son of the free woman was born through promise.

Now this may be interpreted allegorically. These women are two covenants. One is from Mount Sinai, bearing children for slavery, she is Hagar. Now Hagar is Mount Sinai in Arabia, she corresponds to the present Jerusalem, for she is in slavery with her children.

But the Jerusalem above is free, and she is our mother. For it is written, Rejoice, O barren one who does not bear, break forth and cry aloud, you who are not in labor. For the children of the desolate one will be more than those of the one who has a husband.
Galatians 4:21-27 ESV

Living by human effort leads to slavery, but living by God’s promise leads to freedom and identity as His children.

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Big Idea 1: Hagar represents life lived in human effort

Paul begins by reminding the Galatians of Abraham’s two sons. Ishmael, the son of Hagar, was born according to the flesh. His birth was the result of human planning, human problem-solving, and human impatience. Abraham and Sarah tried to accomplish God’s promise through their own strength.

Paul uses Hagar as a picture of what it looks like to rely on human effort in the spiritual life. When believers depend on their own strength to produce spiritual growth, the result is always frustration and bondage. Effort alone cannot fulfill the promises of God.

The Galatians were leaning toward a system that seemed religious but ultimately placed them back into spiritual slavery. Choosing the law over grace is choosing the path of Hagar. It looks disciplined, but it leads to exhaustion.

Believers today often fall into similar patterns. They try to earn God’s approval or force spiritual outcomes through effort alone. Paul calls them to recognize that this path, however familiar, cannot give life.

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Big Idea 2: Sarah represents life lived by God’s promise

Isaac, the son of Sarah, was born through promise. His birth was impossible apart from God’s intervention. It came not from human ability but from divine faithfulness. Sarah’s story shows that God fulfills His promises in His way and in His time.

Paul uses Sarah to represent the covenant of grace. Life with God begins with promise, continues by promise, and is completed by promise. Everything in the spiritual life flows from what God provides, not from what the believer can produce.

The Galatians needed this reminder. They were stepping away from the simplicity of trusting Christ and slipping into a mindset of religious achievement. Paul points them back to Sarah to show that the gospel’s foundation is grace, not effort.

Believers today must guard their hearts as well. When life feels uncertain or slow, the temptation to take matters into our own hands grows strong. Sarah’s story reminds us that God keeps His word, even when the wait feels long.

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Big Idea 3: The two covenants reveal two ways of living

Paul takes the stories of Hagar and Sarah and allegorically applies them. Hagar represents Mount Sinai and the old covenant of law, bringing people into slavery. Sarah represents the new covenant and the Jerusalem above, bringing freedom.

This contrast is not simply theological. It is practical. Every believer must choose which covenant shapes their daily life. Do they live like the children of a slave or the children of a free woman? Do they rely on effort or promise? Or, do they walk in fear or in freedom?

Paul quotes Isaiah to show that God delights in doing the impossible. The barren woman becomes the joyful mother. Grace produces life where human effort fails. This is the heartbeat of the gospel.

For the Galatians, this allegory was a wake-up call. They were acting like children of slavery when they were already children of promise. Paul longs for them to recognize the freedom they already have in Christ.

This truth challenges believers today to examine what covenant shapes their mindset. Freedom belongs to the children of promise.

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Galatians 4:21-27 invites believers to see the dramatic difference between life lived by human effort and life lived by God’s promise. Hagar represents striving, frustration, and bondage. Sarah represents grace, faith, and freedom.

Paul wants the Galatians, and every believer, to recognize their true identity as children of promise. This identity is not achieved. It is received. When believers stop striving and start trusting, freedom grows.

Let this passage draw your heart back to the simplicity of grace and the joy of belonging to the family of God.

Action Step

Identify one area where you are relying on your own effort rather than trusting God’s promise. Pray specifically for the faith to rest in His provision.

Reflection Questions

1. Where do I see myself slipping into human effort instead of trusting God’s promise?
2. How does Sarah’s story strengthen my confidence in God’s timing?
3. What would it look like to live more fully as a child of promise this week?

“Grace accomplishes what effort never can.” Unknown

Prayer

Father, thank You for calling me a child of promise. Teach me to trust Your word more than my own strength. Free my heart from striving and help me rest in the grace You have given through Christ. Amen.

It begins with Christ!

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Blessings,

Chad 

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