Revelation 5:2 - Matthew Poole's English Annotations on the Holy Bible

There were no weak angels, but possibly this angel might, in appearance to John, look as if he were stronger than others; or rather, so judged from the great and loud voice he used. Who is worthy to open the book, and to loose the seals thereof? Not that he thought any was able, or worthy. We can only conclude from hence the impotency of men to search, and find out, and expound the deep things of God, and consequently the unlawfulness of too narrow a prying into his secret mysteries.