How do we know God's mercy is for all people?

Throughout Scripture, God reveals His intention to extend mercy to all people, as seen in the prophetic messages found in the Old Testament. For instance, God's covenant with Abraham promised that through his seed all nations would be blessed. This promise is echoed in the New Testament, particularly in Romans 15, where Paul emphasizes that the gospel of Christ is meant for both Jews and Gentiles. This way, God's mercy is not limited by ethnicity or nationality, but is a sovereign grace offered to all who believe.