I could strengthen you with my mouth, and the solace of my lips would assuage your pain.
Both Job and his friends took the same way that disputants commonly take, which is to undervalue one another's sense, and wisdom, and management. The longer the saw of contention is drawn the hotter it grows; and the beginning of this sort of strife is as the letting forth of water; therefore leave it off before it be meddled with.
Commenting on Job 16:1-5
Though I speak, my grief is not assuaged,.... Though he spoke to God in prayer, and entreated for some abatement of his sorrows, he got no relief; and though he spoke to himself in soliloquies, his sorrow was not repressed nor lessened; he could not administer comfort to himself in the present case, though he might to others in like circumstances, if his own were...
strengthen . . . with . . . mouth--bitter irony. In allusion to Eliphaz' boasted "consolations" (Job 15:11). Opposed to strengthening with the heart, that is, with real consolation. Translate, "I also (like you) could strengthen with the mouth," that is, with heartless talk: "And the moving of my lips (mere lip comfort) could console (in the same fashion as you do)" [UMBREIT]. "Hearty counsel" (Pro 27:9) is the opposite.