The closest anyone has come to an experience of the Divine Glory is probably Moses, whom God revealed His "backside" to. It's the most Moses could handle, because, "No one can see Me and live".
This side of the Beatific Vision we do not truly know the Divine Glory, and were we to experience it, it would destroy us, "It is a fearful thing to fall into the hands of the Living God. It's why being in Christ matters, for we behold the Invisible God clothed in His Incarnate Son, and by this alone we know the Father as Abba, as our Father.
And this, these things alone, are enough that we should fall down, Holy, Holy, Holy, Lord God Almighty, Who was and is and is to come, the earth is full of His glory.
But how much more, once we attain that Beatific Vision, and what we behold by faith now we, then, behold with sight. "No ear has heard, no eye has seen". Holy Holy Holy indeed.
-CryptoLutheran
There is an alternate interpretation which should be considered, and which I think you might well want to consider based on your knowledge of and respect for the Greek Fathers which radiates from your posts and has caused you to be much admired by the Orthodox members of the forum, and has done so much to unite the Traditional Christians.
Firstly, since Jesus Christ is fully God and exists eternally, and since God interacted with Moses anthropically, we can identify his interactions on Mount Sinai as a Christophany.
And we know Jesus Christ, being fully God, is capable of radiating divine light. The most of a beatific vision anyone ever experienced on this Earth was likely the Holy Apostles St. Peter, St. James and St. John the Beloved Disciple on Mount Tabor at the Transfiguration, and I feel very strongly this feast should be celebrated at the original date of August the 6th, and not on the last Sunday before Lent, because celebrating it at that time (which is the practice in some liturgical churches including the Episcopal Church) helps to combat the reduced attendance in American churches in the summer months, along with the intolerable practice of not having a choir in the summer (Orthodox churches and Traditional Latin Mass parishes have a choir year round, and if we can do it, so can liturgical Protestants).
But liturgy aside, returning to the original question:
- Since we know from the text of St. John that no one had seen the Father at any time, but that He was manifest in Jesus Christ, and from other texts that the Father is invisible, we can assert that even the posterior of God the Father would be beyond the abilities of humans to see, if He had one, which seems improbable as He is not incarnate in our human form but rather transcends this creation, in which the Holy Spirit operates and in which the Son and Word was present in our human form, and has appeared according to various church Fathers both in the Old Testament, and there have been appearances of Him since His ascension, Christophanies, for example, to St. Paul on the Road to Damascus, and to St. Gregory the Illuminator in Armenia at the site of their cathedral of Holy Etchmiadzin, Etchmiadzin translated means “God Descended.” This event led to the conversion of the Armenians.
We can likewise attribute the Burning Bush and the Pillar of Fire / Cloud of Smoke that guided the Israelites to the Holy Spirit, but as for the voice heard by Moses when he encountered the Burning Bush, we can’t attribute that. We know from the Gospels of only three occasions when God the Father was heard, but He has only been heard, not seen.
However, the uncreated light at Tabor is believed by the Orthodox to be uncreated, but even this is not regarded as the Divine Essence, which St. Gregory Palamas argued is entirely beyond human comprehension.
The Essence / Energies distinction was most clearly articulated by St. Gregory Palamas, but we find this doctrine emergent in earlier Patristic writings such as those of the Cappadocians. Together with the Incarnation, it allows us to explain all Scriptural theophanies without contradicting the idea of the invisibility of God the Father or the inscrutability of His Divine Essence, which is shared with the uncreated and coequal Son and Holy Spirit, forming the Holy, Undivided and Life-Giving Trinity.
However, that which is beyond our understanding in this life could become comprehensible in the life of the world to come. “Blessed are the pure in heart, for they shall see God.”
And St. Athanasius famously said “God became man so that man could become god” “Becoming by grace what Christ is by nature.” Theosis promises the opportunity to behold what Roman Catholics call the Beatific Vision, but also much more than that. The Beatific Vision by itself sounds lovely, and is not incorrect, but it is not the limit of what God desires from us, which Christ says is perfection on the level of the Father Himself. Metropolitan Kallistos Ware wrote that the life of the World to Come will consist of a process of infinite perfection as we approach the Father.