Galatians 3:20

Now an intermediary is not for one party alone, but God is one. ¹ 

A mediator, however, does not represent just one party; but God is one.

Now a mediator is not for one party only; whereas God is only one.

Now a mediator is needed if two people enter into an agreement, but God acted on his own when he made his promise to Abraham.

But if there is a middleman as there was at Sinai, then the people are not dealing directly with God, are they? But the original promise is the [direct] blessing of God, received by faith.

Now a go-between is not a go-between of one; but God is one.

Now a mediator involves more than one party; but God is one.

Now a mediator does not mediate for one only , but God is one.

Now an intermediary is not for one party alone, but God is one. ¹ 

¹ tn The meaning of this verse is disputed. According to BDAG 634 s.v. μεσίτης, “It prob. means that the activity of an intermediary implies the existence of more than one party, and hence may be unsatisfactory because it must result in a compromise. The presence of an intermediary would prevent attainment, without any impediment, of the purpose of the εἶς θεός in giving the law.” See also A. Oepke, TDNT 4:598-624, esp. 618-19.