But I would strengthen you {e} with my mouth, and the moving of my lips should asswage your grief.

(e) If this were in my power, yet I would comfort you and not do as you do to me.

Jamieson-Fausset-Brown Bible Commentary

5. 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" (Pr 27:9) is the opposite.

Matthew Henry's Concise Commentary

16:1-5 Eliphaz had represented Job's discourses as unprofitable, and nothing to the purpose; Job here gives his the same character. Those who pass censures, must expect to have them retorted; it is easy, it is endless, but what good does it do? Angry answers stir up men's passions, but never convince their judgments, nor set truth in a clear light. What Job says of his friends is true of all creatures, in comparison with God; one time or other we shall be made to see and own that miserable comforters are they all. When under convictions of sin, terrors of conscience, or the arrests of death, only the blessed Spirit can comfort effectually; all others, without him, do it miserably, and to no purpose. Whatever our brethren's sorrows are, we ought by sympathy to make them our own; they may soon be so.