How do we know Christ is the mediator between God and men?

1 Timothy 2:5 explicitly states that there is one God and one mediator between God and men, the man Christ Jesus. This underscores the unique role of Christ in the plan of salvation, indicating that no other mediator, such as Mary or saints, can intercede for us. Christ's mediatorial role is foundational to the Christian faith, as He stands as our advocate before the Father, having completed the work of redemption. Thus, all prayers and supplications must be directed through Him alone.