A "house" is essentially a container -- for a person, a family, several families or even a large group with shared interests (think of the term "houses of worship.") In the Bible, a "house" is also a container, but for spiritual things rather than natural things. In various uses a "house" can represent part of the mind, the whole mind, a whole person or even a church. The other nuance to the word "house" is that it is generally used in regards to our affections and desires rather than our thoughts and principles. This makes sense; we tend to engage our thoughts and rationality when we are out in the world doing our work, but when we are inside our houses we are driven most by love for our families and the desire to be good to those we love. So "house" tends to represent the things we want and care about -- which are ultimately the things that define us.

303. CONJUNCTION OF HEAVEN WITH MAN BY MEANS OF THE WORD.

Those who think from interior reason can see that there is a connection of all things through intermediates with the First, and that whatever is not in connection is dissipated. For they know, when they think about it, that nothing can have permanent existence from itself, but only from what is prior to itself, thus all things from a First; also that the connection with what is prior is like the connection of an effect with its effecting cause; for when the effecting cause is taken away from its effect the effect is dissolved and dispersed. Because the learned thought thus they saw and said that permanent existence is a perpetual springing forth; thus that all things have permanent existence from a First; and as they sprang from that First so they perpetually spring forth, that is, have permanent existence from it. But what the connection of everything is with that which is prior to itself, thus with the First which is the source of all things, cannot be told in a few words, because it is various and diverse. It can only be said in general that there is a connection of the natural world with the spiritual world, and that in consequence there is a correspondence of all things in the natural world with all things in the spiritual (see 103-115); also that there is a connection and consequently a correspondence of all things of man with all things of heaven (see 87-102).