An intermediary represents one person to another. Alternate translation: “Now if we say that there was an intermediary, that means that there must have been more than one person.”
Paul uses this statement to contrast the law and the promise. Paul seems to be saying that the promise is superior to the law since God used an intermediary to give the law, but he did not use an intermediary when he made the promise. “God is one” is an important statement from the Old Testament, so it would be best to translate it as Paul wrote it. If this does not make sense in your language, you could translate it as "God is one God."
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