Verse 18
The speaker asserts certainty ("surely") that God has set them in , picturing prosperity as unstable footing. The second line depicts an active reversal: they are cast down into ruin.
Verse 19
Their end is emphasized as sudden and total: they are destroyed quickly and swept away. The phrase frames the collapse as not only material loss but an overwhelming, frightening unraveling.
Verse 20
Their apparent greatness is compared to a dream that seems substantial until waking. When the Lord acts, their image and plans are treated as insubstantial—like a dream that evaporates when consciousness returns.