How do we know Christ is the mediator of God's decrees?

In Revelation 5, Christ demonstrates His role as the mediator of God's decrees by taking the book that contains the whole counsel of God from the Father’s hand. This action signifies His unique authority to execute the divine plan of salvation. The seals represent that no one else is worthy to reveal or carry out these decrees, highlighting Christ’s unique qualifications and intimate relationship with the Father. His taking of the book assures believers that their salvation rests secure in His accomplished work and sovereign rule.