“Now the other stones which you saw cast far away from the tower, and falling upon the public road and rolling from it into pathless places, are those who have indeed believed, but through doubt have abandoned the true road. Thinking, then, that they could find a better, they wander and become wretched, and enter upon pathless places. But those which fell into the fire and were burned are those who have departed for ever from the living God; nor does the thought of repentance ever come into their hearts, on account of their devotion to their lusts and to the crimes which they committed.
Do you wish to know who are the others which fell near the waters, but could not be rolled into them? These are they who have heard the word, and wish to be baptized in the name of the Lord; but when the chastity demanded by the truth comes into their recollection, they draw back, and again walk after their own wicked desires.” She finished her exposition of the tower. But I, shameless as I yet was, asked her, “Is repentance possible for all those stones which have been cast away and did not fit into the building of the tower, and will they yet have a place in this tower?”
“Repentance,” said she, “is yet possible, but in this tower they cannot find a suitable place. But in another and much inferior place they will be laid, and that, too, only when they have been tortured and completed the days of their sins. And on this account will they be transferred, because they have partaken of the righteous Word. And then only will they be removed from their punishments when the thought of repenting of the evil deeds which they have done has come into their hearts. But if it does not come into their hearts, they will not be saved, on account of the hardness of their heart.”
Source: The Pastor (or "The Shepherd") (New Advent)