Now a mediator is not a mediator of one, but God is one.
Ver. 20. Is not a mediator of one] q.d. God and men were at odds, else what use of a mediator? Sin is the makebate (mischief maker), as being a transgression of the law.
But God is one] One and the same now as of old in taking vengeance on the law's transgressors. Or, God is one party disagreeing or displeased.