How do we know that Jesus is our mediator in the new covenant?

In Hebrews 12:24, we see that believers have come to 'Jesus, the mediator of a new covenant.' This mediation is vital because it emphasizes that the old covenant, based on unattainable laws, is replaced by the grace of Christ. Unlike the previous covenant, which required perfection from believers, the new covenant hinges solely on faith in Christ’s completed work. It is His blood that speaks a better word than that of Abel, highlighting the finality and sufficiency of His sacrifice. Through faith in Christ, believers are granted access to God without the burden of law, showcasing the beauty of grace and mercy.