What does Ephesians teach about Gentiles and the mystery of grace?

In Ephesians 2, Paul addresses the fate of Gentiles, describing their former state as 'aliens from the commonwealth of Israel' without hope. However, through Christ's sacrifice, they are reconciled and granted access to God (Ephesians 2:13). This reconciliation fulfills the mystery of God’s plan to unite all believers, Jew and Gentile alike, into one body, reflecting the manifold wisdom of God. This inclusion is not an afterthought but part of God's eternal purpose, demonstrating His sovereignty and grace throughout history.