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.

909. Verse 15. And another angel went out from the temple, signifies exploration by the Lord of the state of the church in general. This is evident from what follows, namely, that the angel "cried out with a great voice, Send Thy sickle and reap, for the hour for Thee to reap is come, for the harvest of the earth is dried up," which signifies announcement after exploration that it is the time for gathering up the good and separating them from the evil, because this is the end of the church. Also from the signification of "the temple," as being heaven and the church, and the Divine proceeding from the Lord (See above, n. 220, 630, 700). The state of the church in general is here meant, because it is added that "two other angels went forth, one from the temple that is in heaven, and the other from the altar;" and these signify manifestations by the Lord respecting separation. Exploration by the Lord is signified, because an "angel" means in the Word something from the Lord (See above, n. 869, 878, 883); since angels can make no exploration of the state of the church from themselves, but only from the Lord.