'Understand' in the Bible

Who is a wise man, that he may understand this? and he to whom the mouth of Jehovah hath spoken, that he may declare it? Why is the land perished, burnt up like a wilderness, so that none passeth through?

The anger of Jehovah shall not return, until he have executed, and until he have performed the purposes of his heart: at the end of the days ye shall understand it clearly.