Galatians 3:20 says that a mediator works between two parties, but God is one, so the promise he makes rests on his own word alone. Paul wrote this line in his letter to the churches of Galatia, a region of what is now central Turkey, to people who were being pressured to add law-keeping to faith in Christ. The verse is short and dense, and it makes the most sense when you read it as part of Paul’s larger argument about how God’s promise to Abraham reaches its fulfillment.
Now a mediator is not between one, but God is one.
Galatians 3:20 (WEB)
What Galatians 3:20 Means
The phrase “a mediator is not between one” points to the ordinary idea of a go-between. A mediator stands between two sides, each with obligations, and carries messages or terms back and forth. Paul is saying that this arrangement does not describe the promise to Abraham. In that promise, God spoke and acted alone, and no second party was bound to meet conditions before the blessing could arrive.
The second half, “God is one,” is the anchor of the verse. Paul is not making a point about the Trinity here or setting up a theology of the Godhead. He is stressing that the promise rests on one party, the God who made it. The verse does not say that the law is bad, and it does not say that Moses or angels had no role. It says that the promise itself was not a two-sided deal that depended on the human partner keeping his end first.
The Context of Galatians 3:20
Galatians was written by Paul, who is traditionally named as its author, to a group of Gentile and Jewish believers who were being told that they must observe the Jewish law to be fully part of God’s people. Paul’s response was sharp because he saw the gospel itself at stake. Much of the letter defends the idea that Abraham was made right with God through faith, long before the law at Sinai was given.
Verses 17 through 19 set up the problem. Paul says the law came 430 years after the promise and cannot cancel what God had already confirmed. He then asks why the law exists at all, and answers that it was added because of transgressions until the promised offspring arrived. Verse 20 comes in the middle of this explanation, and it reads differently once you see that Paul is contrasting a mediated arrangement, like the law given through angels and Moses, with the direct promise God gave to Abraham.
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.
(WEB)
Paul makes a similar point here, saying the promise to Abraham and his offspring came through faith and not through law. Reading it alongside Galatians 3:20 shows that the promise was grounded in God’s word from the start, not in a later system of obligations.
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)
This passage describes God confirming his promise with an oath, so that those who receive it have strong assurance. It echoes the idea in Galatians 3:20 that the promise is secured by God’s own word and character, giving believers a firm hope.
A Short Prayer From Galatians 3:20
Lord, thank you that your promise does not rest on my performance or on a fragile agreement between two sides. You are one, and you are faithful. When I feel the pressure to earn what you have already promised, remind me that your word stands on its own. Help me rest in your character today, trusting that what you have spoken will come to pass. Teach me to receive your grace and to pass it on to others. Amen.
