Who is the "angel" holding this book in his hand, who stands on the sea and on the land? It is none other than Jesus Christ. The symbolism of verse 1 proves it cannot be anyone else.
We see a time element begin here: The Angel speaks first, roaring, then the seven thunders take up from where He left off and utter their message in turn after Him, in succession. The seven thunders, then, are sequential, not contemporary.
Now, who in the Bible gives the words for His ministers? Jesus Christ. He is the Word! He is the Logos. And the Bible is His authoritative message, which He gives to His prophets and to His apostles to teach others.
So the Head of the church, the original "Lion that roared" (Amos 3:8; Revelation 5:5), the original "thunder," as it were, gives to His servant, John—who was both an apostle and a prophet—a book—His words—to eat, to ingest.
I saw still another mighty angel coming down from heaven, clothed with a cloud. [Who went up in a cloud?] And a rainbow was on his head, his face was like the sun [Whose face is like the sun?], and his feet like pillars of fire. He had a little book open in his hand. And he set his right foot on the sea and his left foot on the land, and cried with a loud voice, as when a lion roars. [Who is the lion of the tribe of Judah?] When he cried out, seven thunders uttered their voices.
