From Gregory Nazianzen, Oration XXXVIII (‘On the Theophany, or Birthday of Christ’ — Section II):
O clap your hands together all ye people, because unto us a Child is born, and a Son given unto us, Whose Government is upon His shoulder (for with the Cross it is raised up), and His Name is called The Angel of the Great Counsel of the Father. Let John cry, Prepare ye the way of the Lord: I too will cry the power of this Day. He Who is not carnal is Incarnate; the Son of God becomes the Son of Man, Jesus Christ the Same yesterday, and to-day, and for ever. Let the Jews be offended, let the Greeks deride; let heretics talk till their tongues ache. Then shall they believe, when they see Him ascending up into heaven; and if not then, yet when they see Him coming out of heaven and sitting as Judge.