Galatians 3:20 Meaning: Why the Promise Needed No Mediator

Now a mediator is not between one, but God is one.

Meaning in one sentence

Galatians 3:20 explains that a mediator implies two parties, but God is one. Paul shows the promise to Abraham was direct, superior to the mediated law.

Galatians New Testament Greek

Context

Paul is writing to Christians in Galatia who have been told they need to follow the Jewish law to be saved. In chapter 3, he argues the opposite: we are saved by faith, just as Abraham was. The promise God made to Abraham came directly from God, with no go-between. But the law, given later, was delivered through angels to Moses, who acted as a mediator between God and Israel. Paul uses this difference to show that the law is temporary and conditional, while the promise is permanent and certain. Verse 20 drives the point home: a mediator only makes sense when two parties are involved, but God is one. He doesn't need a middleman to make His promise good.

Key Words

The word mediator translates the Greek mesitēs. It means a person who stands between two sides, helping them reach an agreement or settle a dispute. Paul says that a mediator implies two parties, not one. The law was given through Moses as a mediator, which means it was a contract between God and Israel. Both sides had obligations. But the promise to Abraham had no mediator. God spoke directly to him.

The word one (Greek heis) carries weight here. Paul echoes the great confession from Deuteronomy 6:4: the Lord is one. God does not share His glory or rely on anyone else to keep His promises. Because He is one, He can act directly, without needing a human representative to make the deal stick. That is why the promise is stronger than the law.

How Christians Read This Verse

Christians across traditions have wrestled with this verse. Many commentators, from Calvin to the Cambridge Bible, agree that Paul is contrasting the mediated law with the direct promise. Some Reformed readers see the verse as emphasizing God's sovereignty: He alone guarantees the promise, making the law's conditions irrelevant. Others, like Matthew Henry, focus on the temporary role of the law as a tutor. Catholic and Orthodox readers note that while the law had a mediator, the new covenant has one mediator too, Jesus Christ (1 Timothy 2:5). The promise to Abraham pointed forward to Christ. The key point all can agree on: the law's mediator shows its inferiority to the promise that God gave directly.

A common misunderstanding

A common misreading is to think Paul is saying there is no mediator at all in God's plan. Some then worry this contradicts 1 Timothy 2:5, where Christ is called the one mediator. In fact, Paul is comparing two specific moments in history: the giving of the law (with Moses as mediator) and the promise to Abraham (given directly by God). He is not denying Christ's role as mediator of the new covenant. His point is that the law's mediated system was always temporary, while God's direct promise stands forever.

Living This Out

This week, you might feel like your standing with God depends on how well you keep up your end of the bargain. You stumble, you fail, and you wonder if you broke the contract. Paul says the promise doesn't work like that. God made it directly to you through Christ. It is not a contract with conditions you have to meet. It is a promise from the one God who never changes. When doubt creeps in, remind yourself: the law needed a mediator because both sides had to perform. The promise needs only God, and He is faithful. Rest in that.

Main takeaway: God's promise to save does not depend on a mediator finding both sides faithful; it rests on God alone, who is one and faithful.

For Families

For ages 5, 8

God made a promise to Abraham all by Himself. He didn't need anyone to help Him. That means God's promise is very strong and true.

For ages 9, 12

Sometimes when two people make an agreement, they get a helper to make sure both sides do what they said. That helper is called a mediator. The law of Moses needed a mediator because both God and Israel had duties. But God's promise to Abraham didn't need a mediator. God just said what He would do, and He did it all by Himself. That shows us that God's promise to save us through Jesus is sure. It doesn't depend on our good behavior. God Himself makes it happen.

Questions People Ask

Why does Paul mention a mediator in Galatians 3:20?

Paul is explaining that the law was given through a mediator (Moses), while the promise to Abraham was given directly by God. A mediator implies two parties, but God is one. This contrast shows the law is conditional and temporary, while the promise is unconditional and permanent.

What does 'God is one' mean in this verse?

It echoes Deuteronomy 6:4, the Shema: 'The Lord is one.' In this context, it means God does not need a partner or representative to make His promise valid. He alone guarantees it, unlike the law which required a mediator between God and Israel.

Does Galatians 3:20 contradict 1 Timothy 2:5, which says Christ is the one mediator?

No. Paul is describing the old covenant law given through Moses. Christ is the mediator of the new covenant. The promise to Abraham was a direct promise that pointed to Christ. Paul's point is that the law's mediated system was inferior, not that all mediators are bad.

Why is this verse considered difficult to interpret?

Many commentators call it one of the hardest verses in the New Testament. Its grammar is compressed, and the connection to the surrounding argument is not immediately obvious. Over 400 interpretations have been suggested. Most agree on the basic contrast between the mediated law and the direct promise.

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