The answer
The Master Christ existed with His divinity from eternity. This means that prior to His Incarnation, He fills Heaven and Earth by His existence, or rather overfills them. When He became incarnate, He filled, and still fills, Heaven and Earth by His existence. He still governs the movement of the universe, and manages the affairs of the living in all of existence.
Of this divine truth, the Lord Jesus Himself says,
“And no man hath ascended up to heaven, but He that came down from heaven, even the Son of Man Which is in Heaven” (John 3:13).
An example of Christ’s perceived existence on earth is that of the lamp that radiates with light. Although it has a body, the light goes out from it through the glass body, spreading to the exterior in all directions.
Another example is that of the Burning Bush, which Moses the Prophet saw consumed with fire, and with the voice of God speaking to him from it. The appearance of God and His openly perceived manifestation in any one place does not bring to nought His existence in Heaven at the same time.
Thus, Christ-to Him be glory-by His incarnation, existed on earth, while in His divinity filling Heaven at the same time while being on earth and everywhere.
His Holiness Pope Tawadros II
Pope Tawadros II, My Faith: A Series of Dialogues on the Creed (Coptic Orthodox Patriarchate, 2014), 73–74.

