The words "mouth" and "lips" are metonyms for the words or messages that a person speaks using his mouth and lips. Here Job is speaking sarcastically and means the opposite of what he says. Alternate translation: "My words would surely not be encouraging to you! They would surely not lighten your grief" or "By speaking to you as you spoke to me earlier, I would not encourage you or lighten your grief!" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-irony]])
This speaks of grief as if it were a heavy physical burden. Alternate translation: "will lessen your grief" or "will help you feel less grief" (See: [[rc://en/ta/man/jit/figs-metaphor]])