For he himself is our peace, who has made us both one and has broken down in his flesh the dividing wall of hostility by abolishing the law of commandments expressed in ordinances, that he might create in himself one new man in place of the two, so making peace, and might reconcile us both to God in one body through the cross, thereby killing the hostility.
(Ephesians 2:14-16 ESV)
In this passage, Paul tells his readers that Jesus has broken down the hostile separation between Jews and Gentiles by fulfilling the law of Moses, thus providing a righteousness that the law could not provide. Giving the Gentiles a hope of salvation, this salvation not being available to certain people but to all people. Removing hostility, but making all who believe one in the family of Christ.
In Romans 9:6-8, Paul says something similar to this. He notes that not all Israel (the nation) belongs to Israel (the person) and that not all who are offspring of Abraham are Abraham’s children. Citing Genesis 21:12, he tells us that “through Issac shall your offspring be named.” Issac was the child who was promised to Abraham by God. Issac wasn’t produced by an act of the flesh alone, but a promise from the mouth of God that Abraham would have kids. There was nothing Abraham could do to achieve the promise… but when God spoke, it came to pass.
In the same way, we now have received a reconciliation to God the father through the work of Jesus on the cross… as a matter of fact, we have received this reconciliation because of the works of Christ… because we can’t, he fulfilled the law perfectly for us.
Praise God Who gave us His Son!