Jesus is THE Prophet - THE Word of God, the exact representation of God, who radiates His glory. We are not left wondering what God is like. He is like Jesus!
Jesus is The Priest - We are impure, He is pure. How can a dirty thing make itself clean? We are just pushing the dirt around. We need an external purification agent - and we have got one. Jesus! This did not just get us back to square one to make a better stab at it next time. Jesus sits in heaven because the job is completed. Sin has been dealt with once and for all. It is finished.
Jesus is The King - He created and sustains all things. He is sustaining the atoms in my body right now. That's why I am more dependant on his word than on bread, because without his word my digestive system can't do anything with the bread! All things belong to Him. All things. All my things. Me. All of it belongs to him, it is his possession.