The anger of the LORD will not turn back until He has fully accomplished the purposes of His heart. In the days to come you will understand this clearly.
KJV
The anger of the LORD shall not return, until he have executed, and till he have performed the thoughts of his heart: in the latter days ye shall consider it perfectly.
ASV
The anger of Jehovah shall not return, until he have executed, and till he have performed the intents of his heart: in the latter days ye shall understand it perfectly.