Galatians 3:20 says that a mediator belongs to more than one party, while God acts alone and is one. Paul’s point is that God’s promise to Abraham rests on God’s own word and faithfulness, not on an arrangement that needs a go-between to hold two sides together. Paul wrote this sentence to the churches of Galatia, who were being pressed to add the Mosaic law to faith in Christ as a requirement for belonging to God’s people.
Now a mediator is not between one, but God is one.
Galatians 3:20 (WEB)
What Galatians 3:20 Means
The verse begins with “a mediator,” a word for someone who stands between two parties to settle or carry out an agreement. Moses is the mediator Paul has in mind, since the law was given through him and angels. A mediator is needed when two sides must each keep their part of a deal, and each can fail.
Paul then says “God is one.” In the promise to Abraham, God spoke alone and bound himself to act. Abraham was not making a bargain with God that required a third party to enforce it. The verse therefore does not say that the law is wicked or that Moses was unimportant. It says the promise is grounded in God’s single, unbreakable commitment.
What the verse does not promise is that human obedience is irrelevant. Paul is describing the basis of the promise, not the daily life of a believer. He is arguing that inheritance comes through what God freely gave, not through a contract that depends on human performance to stay valid.
The Context of Galatians 3:20
Paul wrote Galatians to communities in the Roman province of Galatia, people who had received the gospel of Christ but were hearing teachers who insisted that circumcision and the law were necessary for full membership in God’s family. Paul’s letter is fierce and direct because he sees this as a threat to the good news itself. Most scholars accept Paul as the author, writing in the middle of the first century.
Just before verse 20, Paul explains that the law came 430 years after the promise and cannot cancel it. Just after, he asks whether the law is therefore against God’s promises and answers with an emphatic no. Read in that flow, verse 20 is a step in an argument: the promise is God’s own act, so it stands independent of the later law, and the law’s role was temporary until the promised offspring arrived.
Key Phrases in Galatians 3:20
Romans 4:13
For the promise to Abraham and to his offspring that he should be heir of the world wasn’t through the law, but through the righteousness of faith.
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Paul makes the same point in Romans, showing that the inheritance promised to Abraham came through faith and promise rather than through the law. Reading this alongside Galatians 3:20 strengthens the sense that God’s word of promise stands on its own footing.
Hebrews 6:17-18
17 In this way God, being determined to show more abundantly to the heirs of the promise the immutability of his counsel, interposed with an oath; 18 that by two immutable things, in which it is impossible for God to lie, we may have a strong encouragement, who have fled for refuge to take hold of the hope set before us.
(WEB)
The writer of Hebrews describes God binding himself with an oath so that his people may be strongly encouraged. This passage expands the idea that God’s commitment is singular and certain, which is the heart of what Paul says in Galatians 3:20.
A Short Prayer From Galatians 3:20
Father, thank you that your promises rest on your own faithfulness and not on my ability to hold up my side of every agreement. When I feel the pressure to earn what you have already given, remind me that you are the one who keeps your word. Settle my heart in your steady love so that I can trust you with my decisions and my relationships today. Help me to live from the security of your commitment to me in Christ. Amen.