What glory of the Lord Jesus Christ did he witness? Let another Apostle show us: “When they were fully awake,” he says, “Peter and those with him saw the glory of Christ” (Lk 9:32).
What was this glory? Let another Evangelist come forward and bear witness: “His face shone like the sun, and His garments became white as light” (Mt 17:2).
The Lord showed them that He is God, “clothing Himself with light as with a garment,” according to the Psalmist (Ps 103:2).
Therefore, after saying that he had seen the glory of Christ “on the holy mountain,” a light that illumined, wondrous to say, even hearing, he says: “We have the prophetic word made more sure.”
For there they saw a shining cloud that sounded with words. Thus, after the vision of this glory of Christ, he says this.
What prophetic word made more sure did you receive after the contemplation of the light, O seers of God? What, if not this, that God “clothes Himself with light as with a garment”?
“And you do well,” says the Apostle, “to hold fast to this prophetic word, as to a lamp shining in a dark place, until the day dawns.”
What day? Surely the day that shone forth on Tabor. “And the morning star rises.” What morning star? Surely the one that illumined Peter, James, and John there.
“Until this morning star rises.” Where? “In our hearts” (2 Pet 1:18-19).
Is it not clear that this light now shines in the hearts of the faithful and perfect? Is it not clear that it surpasses the light of knowledge beyond measure?
It differs not only from the knowledge obtained by Hellenic learning. Such knowledge is unworthy even to be called knowledge, being wholly false or mixed with falsehood, and closer to darkness than to light.
I say that the light of this vision differs not only from that knowledge, but also from the knowledge of the divine Scriptures.
The light of knowledge is comparable to a lamp shining in a dark place. The light of mystical vision is comparable to the morning star shining by day, that is, to the sun.
In the apocryphal Acts of the Apostles there are expressions concerning the second Person of the Trinity: “Merciful Father, Savior Christ” (Acts of Thomas A 97, Lipsius R. A., Bonnet M., Acta apostolorum apocrypha, vol. 2, Leipzig, 1903, p. 210, l. 8), and “I am the Father of all these ages” (Acts of Matthew 3, ibid., p. 220, l. 4).
Melito of Sardis, in the second century, also calls Christ Father in On the Passion of Christ, 9.
Theodoret of Cyrus speaks of the saving appellation of Jesus Christ, saying that He is “Father of the age to come, because as Adam is called father of the present age, so He is called Father of the age to come” (Commentary on Isaiah 9:6).
The naming of Christ as Father is also found in some works attributed to Macarius of Egypt and in ascetical and mystical writings of later centuries. Yet it is not found among the great teachers of the Church.
Its basis in Sacred Scripture is Is 9:6: “For unto us a Child is born, unto us a Son is given; the government shall be upon His shoulders, and His name shall be called Wonderful, Counselor, Mighty God, Father of eternity.”