How do we know Jesus is the better mediator?

The claim that Jesus is the better mediator is established through the comparison of Esther's favor with that of Christ. In Esther 2, the king's pleasure in Esther symbolizes God's pleasure in Christ, who is sinless and perfect, as confirmed in passages like Hebrews 4:15. Esther's preference over others signifies that Christ alone fulfills the requirements of God's law perfectly. Therefore, through His sacrifice, He mediates a new covenant, ensuring our acceptance before God. The assurance lies in the perfection of Christ rather than our flawed humanity.