4 He is called Christ, not as having been anointed by men's hands, but eternally anointed by the Father to His High-Priesthood on behalf of men. He is called Dead, not as having abode among the dead, as all in Hades, but as being alone free among the dead. He is called Son of Man, not as having had His generation from earth, as each of us, but as coming upon the clouds To Judge Both Quick and Dead. He is called Lord, not improperly as those who are so called among men, but as having a natural and eternal Lordship. He is called Jesus by a fitting name, as having the appellation from His salutary healing. He is called Son, not as advanced by adoption, but as naturally begotten. And many are the titles of our Saviour; lest, therefore, His manifold appellations should make you think of many sons, and because of the errors of the heretics, who say that Christ is one, and Jesus another, and the Door another, and so on, the Faith secures you beforehand, saying well, In One Lord Jesus Christ: for though the titles are many, yet their subject is one.
Source: Catechetical Lectures (New Advent)