Daniel 4:28 - 30

"All this happened to King Nebuchadnezzar. Twelve months later, as the king was walking on the roof of the royal palace of Babylon, he said, 'Is not this the great Babylon I have built as the royal residence, by my mighty power and for the glory of my majesty?'" NIV translation

The number twelve, throughout the Bible, is associated with the display of divine authority and here we see that twelve months after his vision the king is still denying God's power. The king still does not acknowledge the fact that God had him there. We may be quick to criticize the king but we must ask ourselves if we don't do the same thing sometimes. It is easy to forget to give the credit to God when He lifts us up and blesses us.

Daniel 4:31 - 33

"The words were still on his lips when a voice came from heaven, 'This is what is decreed for you, King Nebuchadnezzar: Your royal authority has been taken from you. You will be driven away from people and will live with the wild animals; you will eat grass like cattle. Seven times will pass by for you until you acknowledge that the Most High is sovereign over the kingdoms of men and gives them to anyone he wishes.' Immediately what had been said about Nebuchadnezzar was fulfilled. He was driven away from people and ate grass like cattle. His body was drenched with the dew of heaven until his hair grew like the feathers of an eagle and his nails like the claws of a bird." NIV translation

As soon as he spoke this blasphemy, he was reminded of the judgment that had been promised and it was swiftly executed. I am sure that the king did not expect this swift judgment as he climbed up to the roof. 

In the same way, we walk around many days without remembering that Jesus could come back at any moment.