How do we know that God's grace extends to all people?

The extension of God's grace to all people, regardless of ethnic background, is a core tenet of Reformed theology. Initially, Christ's ministry was focused on the 'lost sheep of the house of Israel' (Matthew 15:24), yet this did not negate His eventual command for the gospel to be preached to all nations. The walls of division were broken down after His crucifixion and resurrection, as reflected in the Great Commission in Matthew 28:19, where Jesus commands His disciples to make disciples of all nations. This assures us that all who believe, including Gentiles like the Canaanite woman, can receive mercy and salvation through faith in Christ.