How do we know that peace comes through Christ?

The Apostle Paul writes in Ephesians 2:17 that Christ came and preached peace to those who were far off (the Gentiles) and those who were near (the Jews). This highlights that Christ is the sole mediator of peace, reconciling not only individuals to God but also bridging divisions among people. He accomplished this by removing the enmity created by the Law through His death on the cross, which served to unite believers, both Jew and Gentile, into one body. This doctrine is critical as it shows that peace is not merely an absence of conflict but a deep, relational restoration with God and among humanity, made possible through Christ's sacrificial work.