He shall fly away as a dream - As a dream wholly disappears or vanishes. This comparison of man with a dream is not uncommon, and is most impressive. See Psalms 73:20; see the notes at Isaiah 29:7-8.
As a vision of the night - As when one in a dream seems to see objects which vanish when he awakes. The parallelism requires us to understand this of what appears in a dream, and not of a spectre. In our dreams we “seem” to see objects, and when we awake they vanish.