Shared ground
These verses present a simple sequence: overwhelming vision, physical collapse, reassurance by touch and words, and then an explanation of what key images mean. The speaker identifies himself with titles and actions that signal unmatched status (“the first and the last”), real death (“I was dead”), and ongoing life (“alive forevermore”).
The passage also makes an explicit authority claim: the speaker has “the keys of Death and of Hades,” meaning control over what Death/Hades represents. John is then told to write with a three-part scope: what he has seen, what is, and what will happen after. Finally, the vision’s central symbols are interpreted inside the text: seven lampstands represent seven assemblies, and seven stars represent the “angels” of those assemblies.
Where interpretation differs
“Death and Hades.” Some take these primarily as real realms connected to the dead (Death as the event/state of dying; Hades as the place/realm of the dead). Others emphasize them as hostile powers that enslave and destroy, with “Hades” still tied to the dead but functioning as a power in the story.
“Keys.” Many read “keys” as straightforward authority and access control—opening, shutting, releasing, or holding. Others stress the judicial side more strongly: the right to confine or liberate in connection with death and the realm of the dead.
“Angels of the seven assemblies.” Some read “angels” as heavenly beings assigned to each assembly, which fits the normal meaning of “angel” as a spiritual messenger. Others read them as human messengers or representatives (for example, the carriers or readers of the messages), since the messages in chapters 2–3 address the “angel” as accountable in ways that can sound like a community leader.
The three-part writing scope. Some see v.19 as a map of the book’s structure: (1) the initial vision, (2) the present situation of the assemblies, and (3) later visions about what follows. Others think the phrase is more general—an all-inclusive commission to write both present and future revelation—without neatly outlining the book’s table of contents.
Why the disagreement exists
The text explains some symbols directly (stars/lampstands), but it uses compressed images for other things (“keys,” “Death and Hades,” “angels”) that can be taken more literally or more symbolically. Also, the book mixes direct instruction (write) with visionary language, so readers differ on how tightly v.19 is meant to organize the whole work.
What this passage clearly contributes
The passage anchors the entire book in the authority of the risen figure who overcame death and now holds decisive control over death and the realm of the dead. It also frames Revelation as purposeful communication (“write”) that includes past vision, present realities, and future events. And it models how the book expects to be read: some imagery is meant to be interpreted, and sometimes the interpretation is supplied by the vision itself (lampstands = assemblies; stars = angels of the assemblies).