The Father was indeed present in the Son, and in the Lord's brightness, which He had tempered to the disciples' sight, the Father's Essence was not separated from the Only-begotten: but, in order to emphasize the two-fold personality, as the effulgence of the Son’s body displayed the Son to their sight, so the Father's voice from out the cloud announced the Father to their hearing.
Accordingly, dearly-beloved, throughout this time which elapsed between the Lord’s Resurrection and Ascension, God’s Providence had this in view, to teach and impress upon both the eyes and hearts of His own people that the Lord Jesus Christ might be acknowledged to have as truly risen, as He was truly born, suffered, and died. And hence the most blessed Apostles and all the disciples, who had been both bewildered at His death on the cross and backward in believing His Resurrection, were so strengthened by the clearness of the truth that when the Lord entered the heights of heaven, not only were they affected with no sadness, but were even filled with great joy.
Our Saviour, dearly-beloved, was born today: let us be glad. For there is no proper place for sadness, when we keep the birthday of the Life, which destroys the fear of mortality and brings to us the joy of promised eternity. No one is kept from sharing in this happiness. There is for all one common measure of joy, because as our Lord the destroyer of sin and death finds none free from charge, so is He come to free us all.