The number "two" has two different meanings in the Bible. In most cases "two" indicates a joining together or unification. This is easy to see if we consider the conflicts we tend to have between our "hearts" and our "heads" -- between what we want and what we know. Our "hearts" tell us that we want pie with ice cream for dinner; our "heads" tell us we should have grilled chicken and salad. If we can bring those two together and actually want what's good for us, we'll be pretty happy. We're built that way -- with our emotions balanced against our intellect -- because the Lord is built that way. His essence is love itself, or Divine Love, the source of all caring, emotion and energy. It is expressed as Divine Wisdom, which gives form to that love and puts it to work, and is the source of all knowledge and reasoning. In His case the two aspects are always in conjunction, always in harmony. It's easy also to see how that duality is reflected throughout creation: plants and animals, food and drink, silver and gold. Most importantly, it's reflected in the two genders, with women representing love and men representing wisdom. That's the underlying reason why conjunction in marriage is such a holy thing. So when "two" is used in the Bible to indicate some sort of pairing or unity, it means a joining together. In rare cases, however, "two" is used more purely as a number. In these cases it stands for a profane or unholy state that comes before a holy one. This is because "three" represents a state of holiness and completion (Jesus, for instance, rose from the tomb on the third day), and "two" represents the state just before it.

719. Saying to me, "Come, I will show you the judgment of the great harlot who sits on many waters." This symbolizes a revelation about that religion as regards its profanations and adulterations of the Word's truths.

Saying and showing symbolize a revelation. The judgment symbolizes the state of the Roman Catholic religion at its end. The great harlot symbolizes a profanation of the sanctities of the Word and the church, and an adulteration of their goodness and truth. Many waters symbolize the Word's truths adulterated. To sit upon the waters means, symbolically, to possess them and live caught up in them.

To play the harlot, to whore, to behave licentiously and to commit adultery mean, symbolically, to falsify and adulterate the Word, as may be seen in nos. 134, 620, 632 above; and waters symbolize its truths, nos. 50, 563, 614, 685, here those truths adulterated and profaned, because a harlot is said to be on them.

It is apparent from this that "saying to me, I will show you the judgment of the great harlot who sits on many waters," symbolizes a revelation about the aforesaid religion as regards its profanations and adulterations of the Word's truths.

[2] Something similar is said about Babel in Jeremiah:

...Jehovah will... do what He spoke against the inhabitants of Babel. You who dwell upon many waters, abundant in treasures, your end is coming, the measure of your material gain. (Jeremiah 51:12-13)

We say that Roman Catholics adulterated and profaned the Word's truths, because they used the Word's truths to gain dominion over the sanctities of the church and over heaven and to claim for themselves the Lord's Divine power; and to use the Word's truths to gain dominion over the sanctities of the church and heaven is to adulterate them, and to use them to claim for oneself the Lord's Divine power is to profane them.

People know that they use the Word to defend their dogmas. But read those dogmas attentively and you will see that they have used everything that they have taken from the Word to gain dominion over people's souls and to acquire for themselves a power, authority and majesty that is Divine.

It is for this reason that Babylon is named the Mother of the Whoredoms and Abominations of the Earth in verse 5.