What does Luke 21:25 mean?
Jesus has mentioned that the temple is going to be destroyed. The disciples asked what signs will precede that event (Luke 21:6–7). In response, Jesus begins with a synopsis of disasters that will occur between the temple's destruction and His second coming: false messiahs will deceive people, war will break out across the world, and natural and supernatural disasters will afflict humanity (Luke 21:8–11). Jesus then describes in greater detail three things to look for: His followers will be persecuted (Luke 12:12–19), Jerusalem will be destroyed (Luke 21:20–24), and He will return to judge the world and save His followers (Luke 21:25–28).This third section includes a short list of what will take place during the tribulation, especially the end. Jesus' words strongly reflect Old Testament warnings (Isaiah 13:9–10; Ezekiel 32:7–8; Joel 2:10; 3:15).
John will later describe these events. The sun will be darkened and the moon will look like blood (Revelation 6:12–13). A third of the light of the sun, moon, and stars will go out (Revelation 8:12). The sun will burn with intense heat (Revelation 16:8–9) then turn to complete darkness (Revelation 16:10–11). A burning mountain will turn a third of the sea into blood (Revelation 8:8). Everything in the sea will die (Revelation 16:3).
The people living in those days will be in such distress they will beg the mountains to fall on them, to hide them from Jesus' wrath (Revelation 6:15–17). For those who refuse to repent, it will mean the end (Revelation 19:11–21), but for Jesus' followers, it will be their redemption (Luke 21:28).