Why is the priesthood of Christ essential for salvation?

The priesthood of Christ is foundational to sovereign grace theology as it establishes Him as the sole mediator for humanity. According to Hebrews, every earthly priest was limited in that they had to repetitively offer sacrifices that could never fully atone for sin. In contrast, Christ, as the high priest, offered Himself once for all, securing eternal redemption for His people (Hebrews 7:27). His priesthood is after the order of Melchizedek, symbolizing an eternal and effective ministry (Hebrews 7:16). Through Him, believers receive complete forgiveness, and as Hebrews 10:12 proclaims, 'But this man, after he had offered one sacrifice for sins forever, sat down on the right hand of God.' This act not only fulfills the law but also grants believers direct access to God, unencumbered by the weight of sin, affirming their secure and unbroken relationship with the Father.