How do we know that God's grace includes Gentiles?

The narrative in Acts 11 reveals that God had purposed to include Gentiles in His plan of salvation, a truth Peter articulated after witnessing the Holy Spirit fall upon them, just as He did on Jewish believers. Peter recounts how the Spirit directed him to minister to Cornelius, a Gentile, which prefigured the breaking down of barriers between Jews and Gentiles. The inclusion of Gentiles illustrates the profound mystery of the Gospel, which unifies believers in Christ regardless of ethnic divisions, confirming Paul's teaching in Ephesians 2:14-16 that Christ is our peace and has made both groups one. This unification underlines the truth that God's grace is sovereign and unmerited, encompassing all who are entrusted to Him.