How do we know Jesus Christ is our mediator?

Jesus is our mediator because He stands between God and humanity, having perfectly obeyed the law and satisfied God's justice through his sacrificial death. In John 17, Jesus expresses His role as the advocate who pleads for those given to Him by the Father. He is the one who takes our punishment and provides reconciliation, allowing us to approach God confidently. Furthermore, His resurrection assures us that He has conquered sin and death on our behalf, solidifying His position as our high priest.