On showing me these visions, she wished to retire. I said to her, “What is the use of my having seen all this, while I do not know what it means?” She said to me, “You are a cunning fellow, wishing to know everything that relates to the tower.” “Even so, O Lady,” said I, “that I may tell it to my brethren, that, hearing this, they may know the Lord in much glory.” And she said, “Many indeed shall hear, and hearing, some shall be glad, and some shall weep. But even these, if they hear and repent, shall also rejoice.
Hear, then, the parables of the tower; for I will reveal all to you, and give me no more trouble in regard to revelation: for these revelations have an end, for they have been completed. But you will not cease praying for revelations, for you are shameless. The tower which you see building is myself, the Church, who have appeared to you now and on the former occasion. Ask, then, whatever you like in regard to the tower, and I will reveal it to you, that you may rejoice with the saints.”
I said unto her, “Lady, since you have vouchsafed to reveal all to me this once, reveal it.” She said to me, “Whatsoever ought to be revealed, will be revealed; only let your heart be with God, and doubt not whatsoever you shall see.” I asked her, “Why was the tower built upon the waters, O Lady?” She answered, “I told you before, and you still inquire carefully: therefore inquiring you shall find the truth. Hear then why the tower is built upon the waters. It is because your life has been, and will be, saved through water. For the tower was founder on the word of the almighty and glorious Name and it is kept together by the invisible power of the Lord.”
Source: The Pastor (or "The Shepherd") (New Advent)