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Job 14:18ESV·author unknown

“But the mountain falls and crumbles away, and the rock is removed from its place;

Matthew Henry Presbyterian @wholebiblehenry

Job here returns to his complaints; and, though he is not without hope of future bliss, he finds it very hard to get over his present grievances. I. He complains of the particular hardships he apprehended himself under from the strictness of God's justice, Job 14:16, Job 14:17.

Commenting on Job 14:16-22

John Gill Reformed Baptist @doctorgill

And surely the mountain falling cometh to nought,.... Job here returns to his former subject of the irreparable state of man at death, which he illustrates by various other similes, as before; and first by a "mountain falling", which may be supposed, and has been fact, and when it does, it "comes to nought"; it crumbles into dust, and where it falls there it lies...

Jamieson-Fausset-Brown Reformed @jfbcommentary

cometh to naught--literally, "fadeth"; a poetical image from a leaf (Isa 34:4). Here Job falls back into his gloomy bodings as to the grave. Instead of "and surely," translate "yet"; marking the transition from his brighter hopes. Even the solid mountain falls and crumbles away; man therefore cannot "hope" to escape decay or to live again in the present world (Job 14:19). out of his place--so man (Psa 103:16).