“As to those who were cut down and thrown far away from the tower, do you wish to know who they are? They are the sons of iniquity, and they believed in hypocrisy, and wickedness did not depart from them. For this reason they are not saved, since they cannot be used in the building on account of their iniquities. Wherefore they have been cut off and cast far away on account of the anger of the Lord, for they have roused Him to anger. But I shall explain to you the other stones which you saw lying in great numbers, and not going into the building.
Those which are rough are those who have known the truth and not remained in it, nor have they been joined to the saints. On this account are they unfit for use.” “Who are those that have rents?” “These are they who are at discord in their hearts one with another, and are not at peace among themselves: they indeed keep peace before each other, but when they separate one from the other, their wicked thoughts remain in their hearts. These, then, are the rents which are in the stones.
But those which are shortened are those who have indeed believed, and have the larger share of righteousness; yet they have also a considerable share of iniquity, and therefore they are shortened and not whole.” “But who are these, Lady, that are white and round, and yet do not fit into the building of the tower?” She answered and said, “How long will you be foolish and stupid, and continue to put every kind of question and understand nothing? These are those who have faith indeed, but they have also the riches of this world.
When, therefore, tribulation comes, on account of their riches and business they deny the Lord.” I answered and said to her, “When, then, will they be useful for the building, Lady?” “When the riches that now seduce them have been circumscribed, then will they be of use to God. For as a round stone cannot become square unless portions be cut off and cast away, so also those who are rich in this world cannot be useful to the Lord unless their riches be cut down. Learn this first from your own case. When you were rich, you were useless; but now you are useful and fit for life. Be useful to God; for you also will be used as one of these stones.”
Source: The Pastor (or "The Shepherd") (New Advent)