Eph 2:17-18, 17 And He came and preached peace to you who were afar off and to those who were near. 18 …
The more noteworthy work of reconciliation is seen in the book of Acts. Once the Holy Spirit fell upon believers, the gospel began to spread to those near (the Jews). The mandate was to preach the gospel in Jerusalem, Judea, Samaria, and to the uttermost parts of the world (Acts 1:8). It took time as God worked in men like Peter who were still hesitant of going to non Jews. It took the martyr of Stephen for the gospel to spread to those who were far off (the Gentiles). The gospel was that of peace and reconciliation to God and one another.
You read of the distinct actions of the Holy Spirit in converting, filling and demonstration through speaking with tongues. The Jews who request for signs (1Cor 1:21-25) finally comprehended that the Gentiles were included in God’s plan of salvation and that “18 …through Him we both have access by one Spirit to the Father.” (Trinity).
The middle wall of partition was broken down, and through Christ we, both Jews and Gentiles, all mankind, have equal access by one Spirit unto the Father. The Spirit of adoption enables both to cry, “Abba, Father.” Both pray to one Father; subsequently, all are unified as brethren. There are no second-class citizens in the kingdom of God for “There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus.”, (Gal 3:28).