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.

584. 13:6 Then it opened its mouth in blasphemies against God and His name. This symbolizes their assertions, which are scandalous, against the Divine itself and the Lord's Divine humanity, and at the same time against everything that the church has from the Word by which the Lord is worshiped.

Its opening its mouth in blasphemies symbolizes assertions which are falsehoods. A mouth symbolizes doctrine, preaching and discourse (no. 452). Therefore to open the mouth means, symbolically, to utter those falsehoods. Blasphemies symbolize falsifications of the Word and more, as said in nos. 571, 582 above, here scandalous assertions as well, because the phrase follows, "against God and His name." God symbolizes the Lord's Divinity, as is the case often elsewhere in the book of Revelation. And His name symbolizes everything by which the Lord is worshiped, including the Word, because worship is conducted in accordance with it (no. 81).

That the name of Jehovah or of God symbolizes the Lord's Divine humanity and at the same time the Word, as well as everything by which He is worshiped, can become further seen from the following passages:

(Jesus said,) "Father, glorify Your name." Then a voice came from heaven, saying, "I have both glorified it and will glorify it again." (John 12:28)

(Jesus said,) "I have manifested Your name to... men... and I have made known to them Your name...." (John 17:6, 26)

Whatever you ask in My name, that I will do, that the Father may be glorified in the Son. If you ask anything in My name, I will do it. (John 14:13-14)

In the beginning was the Word, and the Word was with God, and the Word was God... As many as received Him, to them He gave the right to become children of God, to those who believe in His name... And the Word became flesh... (John 1:1, 12, 14)

(Jesus said,) ."..he who does not believe (in Him) is judged already, because he has not believed in the name of the only begotten Son of God. (John 3:18)

In the second commandment of the Decalogue, the name of Jehovah God that is not to be profaned, and in the Lord's Prayer, the name of the Father that is to be hallowed, have precisely this meaning.