To build something generally means to put together a variety of simpler pieces to make a useful and more complex structure, as to build a house out of wood or bricks, and it is commonly used this way in the Word. In the land of Shinar men wished to build a tower, and in the new testament Jesus advised that a wise man should build his house on a rock. But in a representative sense the meaning is to build a mental and spiritual structure, like the doctrine of a church or the individual concepts of spiritual reality in a single mind. The building materials are representative also. The tower of Babel was built of brick, which is man-made rock, or representatively, man-made "truths", that is"truths" not from God but ideas of spiritual reality thought out by men. The house that the wise man would build was founded on a natural or "God-made" rock, which means a truth from the Word.

To gather, as in Genesis 6:21, refers to things gathered together in the memory of man. It also implies that good things and truths should be gathered together in man before he is regenerated. To gather together in a place to battle, as in Revelation 16:1, signifies the start of combat against truths in defense of falsities. The ancients were accustomed to say that, when anyone died, that he was gathered to his fathers, or to his people, and they understood that he actually came to his parents, his relations and kinsfolk in another life. 'To be gathered to his fathers' means that a person would join the spiritual community sharing similar good loves. 'To be gathered to his people' means that a person would join the spiritual community that holds same true ideas.

(References: Apocalypse Explained 16; Arcana Coelestia 679, Genesis 10, 25, 25:10)