“…After them entered a large number of idolaters who did not know the law of Christ, but by nature observed it by obeying their conscience. Many glowed like the sun because of their purity and goodness, and the Lord gave them Paradise and radiant crowns braided with roses and lilies. However, they were blind since they had been denied Holy Baptism. They could not see the glory of God at all, because Holy Baptism is the light and eye of the soul. That’s why, he who does not receive it, even if he does an infinite amount of good, he certainly inherits the bliss of paradise and experiences something of its fragrance and sweetness, but he sees nothing.”
St. Nephon’s Vision of the Future Judgment, Stories, Sermons, and Prayers of St. Nephon: An Ascetic Bishop, pp. 58-76, tr. by Archimandrite Ignatios Apostolopoulos.
NOTE: This is why an orthodox baptism is so important for converts to orthodoxy. Even if one has an orthodox chrismation, but not an orthodox baptism, the eyes of their soul will not be opened. Thus, even if they are saved, they will experience paradise blind. Elder Ephraim has also confirmed this via visions of converts who were saved but had only received chrismation without an orthodox baptism. They experienced the bliss of paradise but could not see it.