4:1: After these things [the vision of Jesus and his messages as described in 1:9–3:22] I looked and—behold, an opened door in heaven! And the first voice, which I’d heard, [a voice] as of a trumpet speaking with me [= Jesus’ voice as described in 1:10–11] [was] saying, “Come up here, and I’ll show you things that must happen after these things.” “After these things I looked” introduces the second vision recorded in Revelation. “Behold” spotlights the “opened