Job 6:12

Is my strength the strength of stones? -That is, like a rampart or fortification made of stones, or like a craggy rock that can endure assaults made upon it. A rock will bear the beatings of the tempest, and resist the floods, but how can frail man do it? The idea of Job is, that he had no strength to bear up against these accumulated trials; that he was afraid that he should be left to sink under them, and to complain of God; and that his friends were not to wonder if his strength gave way, and he uttered the language of complaint. Or is my flesh of brass? -Margin, “brazen.” The comparison used here is not uncommon. So Cicero, Aca. Qu. iv.