Jeremiah 30:15
Why criest thou for thine affliction? thy sorrow is incurable for the multitude of thine iniquity: because thy sins were increased, I have done these things unto thee. Why criest thou for thine affliction? thy sorrow is incurable for the multitude of thine iniquity: because thy sins were increased, I have done these things unto thee.
The affliction and incurable sorrow came because iniquity was great and sins were increased and multiplied, and God himself had brought these things upon Judah and Israel as punishment and judgment for that iniquity. Affliction and distress are the harvest of transgression that follows when the enemy tempts people away from God, and God permits them as corrective judgments because of iniquity and increased sin. The incurable sorrow is the shame of apostasy after failing in the calling to be a light to the world, with rejection and killing of the Messiah standing as the grave consequence of that sin.
The judgment stands within the larger promise that God will gather his people, when sorrow is changed into joy and Israel returns from captivity. The verse belongs to the prophecy of Jacob's trouble, whose gathering and deliverance of Israel occur together with the restoration and new spirit promised in Ezekiel 36. That gathering and deliverance take place at the beginning of the day of the Lord, just before the resurrection of the just.