Adam Clarke on Job 11:16

Because thou shalt forget thy misery - Thou shalt have such long and complete rest, that thou shalt scarcely remember thy labor.

As waters that pass away - Like as the mountain floods, which sweep every thing before them, houses, tents, cattle, and the produce of the field, and are speedily absorbed by the sandy plains over which they run, so shalt thou remember thy sufferings: they were wasting and ruinous for the time, but were soon over and gone.