What does Isaiah 24:18 mean?
So far Isaiah has been presenting an oracle against the entire earth. This has detailed the Lord's judgment to come on humanity for our sinful rebellion against Him (Isaiah 24:1–13). Yet amidst all the destruction, some have come to faith in Christ. These new believers sing praise to their redeemer from the ends of the earth, even in this dark era (Isaiah 24:14–16).However, the Lord will not hold back His final judgment of the earth. New believers in these final days have a secure resting place in eternity with God. The rest of humanity's survivors have only the earth to trust in, and the Lord is turning the earth against them.
Isaiah has given ominous warnings about the dangers to come (Isaiah 24:17). Here, he repeats the concepts just mentioned as if they were literal traps. In that word picture, people run in terror from something they can hear, but likely cannot see. Panic prevents them from seeing that they are running headlong into something even worse: the pit. Some who fall in manage to crawl out, but they are caught in yet another trap. Whatever this final combination of terror, pit, and snare is, there will be no escape for those under the Lord's judgment.
Scripture provides few details about what these things are. However, there are hints. The "windows of heaven are open," suggesting downpours of rain. Perhaps this onslaught of rainfall will bring floods and turn once-solid earth into unreliable muck. At the same time, the prophet suggests earthquakes (Isaiah 24:19) that will make the ground even more unstable. The earth itself will become unreliable, leaving those who remain with nowhere to turn for safety.