King Nebuchadnezzar wanted to show the world the goodness that God had bestowed upon him. So he acknowledged God’s dominion and kingdom as everlasting. He praised him for his greatness and mightiness. 
He made a statement. 
There are power in our words. They are like a starting point for how people decide to view us. Make your statement of faith so God can get the credit for the goodness in your life. 
Scripture taken from:

Daniel 4:1-3