One God; God is here taken personally for the Father, the other two Persons being before mentioned, Ephesians 4:4,5. And Father of all; of all believers. Who is above all; not only in the excellencies of his nature, but especially in his sovereign dominion over the church. And through all; by his special providence, through all the members of the church. And in you all; by inhabitation, and the conjunction of believers with him. Though the former two may be applied to God's universal dominion and providence over all the creatures, yet, the apostle speaking of the conjunction of believers in one Father, they are both to be restrained according to this last clause.
Related Commentaries of Ephesians 4:6
Ephesians 4:6
6 One God and Father of all, who is above all, and through all, and in you all.