And on that day the building was finished, but the tower was not completed; for additional building was again about to be added, and there was a cessation in the building. And the six men commanded the builders all to withdraw a little distance, and to rest, but enjoined the virgins not to withdraw from the tower; and it seemed to me that the virgins had been left to guard the tower. Now after all had withdrawn, and were resting themselves, I said to the Shepherd, “What is the reason that the building of the tower was not finished?”
“The tower,” he answered, “cannot be finished just yet, until the Lord of it come and examine the building, in order that, if any of the stones be found to be decayed, he may change them: for the tower is built according to his pleasure.” “I would like to know, sir,” I said, “what is the meaning of the building of this tower, and what the rock and gate, and the mountains, and the virgins mean, and the stones that ascended from the pit, and were not hewn, but came as they were to the building.
Why, in the first place, were ten stones placed in the foundation, then twenty-five, then thirty-five, then forty? And I wish also to know about the stones that went to the building, and were again taken out and returned to their own place? On all these points put my mind at rest, sir, and explain them to me.” “If you are not found to be curious about trifles,” he replied, “you shall know everything. For after a few days [we shall come hither, and you will see the other things that happen to this tower, and will know accurately all the similitudes.”
After a few days] we came to the place where we sat down. And he said to me, “Let us go to the tower; for the master of the tower is coming to examine it.” And we came to the tower, and there was no one at all near it, save the virgins only. And the Shepherd asked the virgins if perchance the master of the tower had come; and they replied that he was about to come to examine the building.
Source: The Pastor (or "The Shepherd") (New Advent)