How do we know the mediatorial kingdom of Christ is true?

Biblically, the existence of Christ's mediatorial kingdom is affirmed in both the Old and New Testaments. Daniel 7 provides a prophetic foundation where the Son of Man is given eternal dominion, illustrating His role as the mediator of God's covenant. This role is fulfilled through Christ's incarnation, His atoning sacrifice, and His resurrection, which are historically documented. The proclamation that all nations will serve Him confirms the ultimate authority and His kingdom's everlasting nature, as evident through the New Testament writings, specifically in the Great Commission (Matthew 28:18-20).