How do we know that Jesus is the true son of David?

The assertion that Jesus is the true son of David is supported by His royal lineage and the fulfillment of prophecy. The promise given to David that his throne would be established forever (2 Samuel 7:12-13) points to the eternal kingdom of Christ, which is fulfilled in Jesus's birth and kingship. Contrary to the Jewish expectation of a king who would restore an earthly kingdom, Jesus articulated that His kingdom is not of this world (John 18:36). This fulfillment is comprehensive, showcasing that while many may look for physical signs of His reign, the true nature of His kingdom is spiritual and everlasting.