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.

3868. 'She conceived again and bore a son' means spiritual conception and birth from what is external towards things that are more internal still. This is clear from what has been stated above in 3860, where the same words occur. An advance is said to be made from what is external towards things that are more internal still when that advance is from knowledge, which is a property of the understanding, to the will; or spiritually speaking, from truth which is the truth of faith to charity. For the understanding is that which proceeds from the will and gives the will a certain visual form, as faith in a similar way proceeds from charity and gives charity a certain outward form. From this it is evident that the external manifestation of the will is the understanding and the external manifestation of charity is faith. Or what amounts to the same, it is evident that the internal substance of the understanding is the will and the internal substance of faith is charity. Consequently an advance from what is external to things that are more internal still consists in an advance from faith in the understanding to faith in the will, and so from faith to charity - which is represented by 'Levi', dealt with shortly below.

[2] It should be recognized that when distinguished from charity the word faith is used to mean truth, such as the truth of doctrine, that is, such as is incorporated in the confession called the Apostles' Creed. This usage is in accord with the general meaning the word has in the Church, for the belief is that possessing faith in truths constitutes the faith through which salvation comes. Few know that faith is trust and confidence, and among these few fewer still know that trust or confidence originates in charity and is unable to exist with anyone who does not possess the life of charity.