Revelation 5:2 - Ellicott's Commentary On The Whole Bible

And I saw a strong (better, mighty) angel proclaiming with (or, in) a loud voice, Who is worthy... — We must not let the word “worthy” pass as though it were simply equivalent to “strong enough.” It seems to imply moral fitness (comp. Romans 1:4), which is the true strength in the heavenly world. It was not lack of intellectual capacity so much as the taint of moral unworthiness which hindered the reading of the book. This is in harmony with what we have noticed before. “To commune with God, there is need of no subtle thought, no foreign tongue, no newest philosophy: ‘ the pure in heart shall see Him:’ and Fox and Bunyan can more truly make Him known than ‘masters of sentences’ and ‘ angelic doctors.’” Those who are willing to do God’s will know of God’s doctrine. This thought corresponds, too, with the stress which is laid (in Revelation 5:5) on the victory of Christ. It is not simply as divine Son of God, but also as victorious Saviour and King of His people, that He opens the book: His worthiness has been established in conflict and temptation (John 14:30; Hebrews 2:9; Hebrews 4:15).