you, O king, are that tree! For you have become great and strong; your greatness has grown to reach the sky, and your dominion extends to the ends of the earth.
Daniel tells Nebuchadnezzar directly that he is the tree whose greatness has reached the sky.
This verse identifies the king as the object of the dream's judgment.
19For a time, Daniel, who was also known as Belteshazzar, was perplexed, and his thoughts alarmed him. 20The tree you saw that grew large and strong, whose top reached the sky and was visible to all the earth, 21whose foliage was beautiful and whose fruit was abundant, providing food for all, under which the beasts of the field lived, and in whose branches the birds of the air nested— 22you, O king, are that tree! For you have become great and strong; your greatness has grown to reach the sky, and your dominion extends to the ends of the earth. 23And you, O king, saw a watcher, a holy one, coming down from heaven and saying: 24This is the interpretation, O king, and this is the decree that the Most High has issued against my lord the king: 25You will be driven away from mankind, and your dwelling will be with the beasts of the field. You will feed on grass like an ox and be drenched with the dew of heaven, and seven times shall pass you by, until you acknowledge that the Most High rules over the kingdom of mankind and gives it to whom He wishes. 26As for the command to leave the stump of the tree with its roots, your kingdom will be restored to you as soon as you acknowledge that Heaven rules. 27Therefore, may my advice be pleasing to you, O king. Break away from your sins by doing what is right, and from your iniquities by showing mercy to the oppressed. Perhaps there will be an extension of your prosperity.”