Jeremiah 15:18

“Why is my pain perpetual, etc.] The pain of his mind; his uneasiness for the good of his people, which was likely to last, having no hope of a change for the better: or it may design the pain which they gave him by their reproaches and persecutions of him, which seemed as if they would have no end: and my wound incurable, which refuseth to be healed? the same thing is meant as before. The allusion is to an old ulcer, or obstinate wound, which no medicine can affect, is desperate and deadly; and such the prophet reckoned his case to be, or however deprecates it, and expostulates with God why it should be so: wilt thou be altogether unto me as a liar, and as waters that fail? such God cannot…”

“(Jer 30:15). "Pain," namely, the perpetual persecution to which he was exposed, and his being left by God without consolation and "alone." Contrast his feeling here with that in Jer 15:16, when he enjoyed the full presence of God, and was inspired by His words. Therefore he utters words of his natural "infirmity" (so David, Psa 77:10) here; as before he spoke under the higher spiritual nature given him. as a liar, and as--rather, "as a deceiving (river) . . . waters that are not sure (lasting)"; opposed to "tiring (perennial) waters" (Job 6:15). Streams that the thirsty traveller had calculated on being full in winter, but which disappoint him in his sorest need, having run dry in the heat…”

“This is the prayer of a man in bitter grief, whose human nature cannot at present submit to the divine will. God’s long-suffering toward the wicked seemed to the prophet to be the abandonment of himself to death; justice itself required that one who was suffering contumely for God’s sake should be delivered. Rebuke - i. e., reproach, contumely. Jeremiah 15:16 Thy words were found - Jeremiah’s summons to the prophetic office had not been expected or sought for by him. I did eat them - i. e., I received them with joy. This eating of the divine words expresses also the close union between that which came from God and the prophet’s own being. I am called by thy name - i. e., I am consecrated to…”

“Why - Jeremiah, though a great prophet, was (as Elijah) a man subject to like passions with other men. Jeremiah 15:19”

“15:18 Jeremiah posed two rhetorical questions that seem to presuppose that he should not have to suffer.”

“my pain: Jer 14:19; Psa 6:3, Psa 13:1-3; Lam. 3:1-18 my wound: Jer 30:12, Jer 30:15; Job 34:6; Mic 1:9 as a: Jer 1:18, Jer 1:19, Jer 20:7 and as: Jer 14:3; Job 6:15-20 fail: Heb. be not sure Jeremiah 15:19”