How do we know the doctrine of the mediator is true?

We know the truth of the mediator doctrine from Scripture, particularly through verses such as 1 Timothy 2:5 and John 17, where Jesus Himself affirms the necessity of His mediatorial role. The Old Testament also foreshadows this necessity through the sacrificial system, indicating that true access to God requires a mediator. The fulfillment of this in the person of Jesus Christ, both God and man, demonstrates the divine orchestration of redemption. In historical context, the Apostles consistently teach on this doctrine, presenting Christ's work as the only effective means of reconciliation to God. The consistent witness of biblical authors affirms that there is no other name under heaven by which we must be saved, solidifying the truth of the mediator's role.