St Nikodemos the Hagiorite wrote in his A Handbook of Spiritual Counsels
section "The Mind before and after Holy Baptism"
Have you envisioned these matters witht your imagination? Notice now , as some have said, how this king, that is the mind, is simple, pure, integral, and rational light according to its nature, just as soon as it is poured into the body with its perfect organization. Before Holy Baptism, the mind, being covered by the darkness of original sin, does not seee clearly. Bur after Hoy Baptism, the mind becomes all light, reflecting the supernatural light of Divine Grace. As St.John Chrysostomos said, the mind shines brighter than the rays of the sun, as long as it remains baove the darkness of willful sinfulness. for this is how that good and eloquent tongue has interpreted that apostolic word: "And we, who with unveiled faces all reflect the Lord's Glory, are being transformed into His likeness with ever-increasing Glory" (2 Cor. 3:18) Interpreting this passage, St.Chrysostom wrote:
What is the reflection of the Lord's Glory and the transformation into his likeness? This was more clearly indicated whenever He revealed the Grace of the miralcles. And yet this is no more difficult to seee now for one who has eyes of faith. For no sooner are we baptized than the soul shines brighter thatn the sun, being purified by the Holy Spirit. And not only do we seee the Glory of God but we also revieve from it a certain splendor just as a clear pieve of silver in the rays of the sunreflects those very rays it receives. But what a pity! It is only right ot sigh here bitterly! For this glory which is ineffable and awesome remains within us only one or two dyas. For we extinguish it, being led astray by the winter of worldly cares, the dense clouds of which block out its rays. For the cares pertaining to living are indeed a heavy winter and even more sullen than winter."