Nothing humbles likes utter humiliation. Ever though Nebuchadnezzar was impressed with God’s power in the furnace incident, he did not come to terms with his own standing before God. His pride and position caused him to accept the worship of others as if he were a god.
Though God sent him a dream to warn against idolatry, Nebuchadnezzar didn’t take the warning to heart. What would get this guy’s attention? Behaving like a dumb beast finally clinched the issue: If Nebuchadnezzar had a greater ears for God than a grasschewing cow, let him act like one.
DANIEL 4:31-32- 31. While the word was in the king’s mouth, there fell a voice from heaven, saying, O king Nebuchadnezzar, to thee it is spoken; The kingdom is departed from thee.
32. And they shall drive thee from men, and thy dwelling shall be with the beasts of the field: they shall make thee to eat grass as oxen, and seven times shall pass over thee, until thou know that the most High ruleth in the kingdom of men, and giveth it to whomsoever he will