Revelation of glory…

The Word of God, born once in the flesh (such is his kindness and his goodness), is always willing to be born spiritually in those who desire him. In them he is born as an infant as he fashions himself in them by means of their virtues. He reveals himself to the extent that he knows someone is capable of receiving him. He diminishes the revelation of his glory not out of selfishness but because he recognises the capacity and resources of those who desire to see him. Yet, in the transcendence of mystery, he always remains invisible to all.
–Saint Maximos the Confessor (580-662)

So in the saints…

As a drop of water poured into wine loses itself, and takes the color and savor of wine; or as a bar of iron, heated red-hot, become like fire itself, forgetting its own nature; or as the air, radiant with sun-beams, seems not so much to be illuminated but to be light itself; so in the saints all human affections melt away by some unspeakable transmutation into the will of God… The human substance will endure, but in another beauty, a higher power, a greater glory.
–Saint Bernard of Clairvaux (1090-1153)