Galatians 3:20 (ESV) – Now an intermediary implies more than one, but God is one.
A simple statement of fact here. If someone is acting as a mediator between parties that need mediation, it is obvious that there is more than one person involved. There must be at least three – the offended party, the offending party, and the mediator.
The Mediator referred to in this verse is Moses. Paul is telling us that Jesus Christ is better than Moses. But this verse makes us think about the mediation of Christ for His people.
In saving people from sin and its consequences, God is both the offended party and the One who offers mediation. This, in normal mediation situations, would not bode very well for one of the parties. If the one person acts as His own mediator then there really is no mediator at all.
But God can supply His own mediation. The trinity allows it. Both the Mediator and God are one and yet God is not acting as His own Mediator, His Son is. As the Mediator, Christ both fully and perfectly represents God’s side of things and He perfectly represents ours. He is all that we need in order for us to have standing before God and He is all that all that God requires in order for Him to allow us audience with Himself.
This is a powerful text about the essential nature of God. See here that if God is not multi personned, then He cannot save anyone. No one would ever make up something as wild as this. This is revealed to us by God Himself. It is a mind boggling thrill to the soul. Oh what God has done!
Read a good sermon on this verse here