Ezekiel was given an awesome privilege. He was given a brief view of the celestial throne room. He struggles to find the adjectives to describe this vision. Jewish Tradition mandates that a person must have mastered Torah before studying Ezekiel. He is trying to describe the indescribable.
Ezekiel has an intimidating call. God tells him that the people will be rebellious, they will not listen, they will not fear the Word. In spite of this, he must preach the Word faithfully. God then tells Ezekiel to eat the scroll. The Word must become a part of him. You are what you eat, so to speak. The Word of God must become the very warp and woof of our being. So that all our experiences and thoughts are under its purview.