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.

To command is to give an order that something must be done, and is directed to an individual, or a group. It is an imperative, not a suggestion. Commanding can be done in two ways, or from two differing motives. It often comes in an organization, where it is used to impose an order that is necessary to do the organization's work, such as a business, or government or an army, and can be legitimate, or is used in a family by parents to maintain an orderly home. But it can also be used by a person who loves power and having gotten it in some way, loves to impose his or her will on others for selfish gratification. So one motive is love of a use, or of good, and the other is for the love of self, or possessions. The Lord, from His infinite love, has given mankind commandments because He is order itself, and knows that our happiness to eternity depends on our acceptance of His order of creation, which ultimately is the only order that exists.