How do we know that Jesus is the mediator between God and man?

According to 1 Timothy 2:5-6, Paul affirms that there is only one God and one mediator between God and humanity, which is the man Jesus Christ. His role as mediator underscores the uniqueness of Christ's sacrificial work; He gave Himself as a ransom for all, pointing to His atoning death as the means of reconciling sinful humans to a holy God. This concept is central to Reformed theology, which holds that Jesus' mediating work is effective for His elect, encompassing all people from various backgrounds and statuses. The sufficiency of Christ's work assures believers that through Him, access to God is granted, and salvation is secured.