And I saw a strong angel proclaiming with a loud voice, Who is worthy to open the scroll, and to loose the seals thereof?
All Commentaries on Revelation 5:2 Go To Revelation 5
Caesarius of Arles
AD 542
who is worthy.... It is because Christ opened the book when he undertook the work of the Father's will, was conceived, and was born. The He broke its seals when He was slain for the human race.