How do we know that Christ is the riches of the Gentiles?

The affirmation that Christ is the riches of the Gentiles is embedded in the fulfillment of Old Testament prophecies. Isaiah 61 speaks of the coming salvation and how both Jews and Gentiles are included in God's promise. In the New Testament, Apostle Paul elaborates that the riches that Christ brings involve deliverance from sin and the impartation of His righteousness. This is made evident in verses that speak of God's grace being revealed to all nations; hence, Christ stands as the eternal treasure for His people, embodying their hope, righteousness, and salvation.