Honor

Anyone can obey other person or authority. One must respect others for who are and what they represent in your life.  It is through dignifying, venerating, obeying and respecting one can begin to honor their Master/Sir. One must adhere to right ethical conduct. One must develop a sense of integrity in their thoughts and deeds. One must strive to act honestly, trustworthy, principled and fair even when others are not acting likewise. Then one can say they are honoring another or their Master/Sir.
Honor feeds the House's spirit.

Loyalty

Much has been written about being loyal to another. But being loyal is more than obeying or following a leader. Being loyal is also speaking up when something is wrong even when no-other person will speak up. A person who is steadfast in his devotion and sincerity has the beginnings of loyalty. But one must be also honest in his words and deeds. The bdsm life is based on trust or faith in another person.  If a Master/Sir has the trust of  his sub/slave then in time that trust will grow into devotion and loyalty. With his loyal sub/slave at his side, a Master/Sir will be able to achieve great strides in the bdsm life.
Loyalty allows the household members to grow in unexpected and new ways.

Service

It is not enough to do what you are told to do. It is not enough to wait to be told to do something. One must attend to the needs of your Master/Sir without ever being asked to do so. To be "at your service" means to put forth the effort to be there before you are needed. To learn what is needed before it is spoken or commanded of you. This includes the day to day things. Anyone can wait on his Master/Sir during a meal. But can you anticipate or flow with the needs of your Master/Sir during an unstructured event or day?  Being of service to your Master/Sir in all areas of life is an important part of being a sub/slave. Service can be of the order of just being present, to doing household choirs, to shopping, scening and of course sexual needs. Any service performed for your Master/Sir should be done of a free mind and spirit. Otherwise the service will become corrupted and of no use. Service is about doing for other people not yourself.  Performing the service (whatever it is) should be reward in of itself. To ask or want more is not proper thought or attitude.
Service is the purist expression of the house's spirit.

Duty

This leg of the Household Motto on the surface seems redundant to the Loyalty and Service. But in the eastern traditions is not the same. It is the person's sense of responsibility that binds them to honorable and loyal service to their Master/Sir and his household. Without a sense of responsibility in the bdsm life, there will not be any flow of energies between the sub/slave and his Master/Sir. Anyone can session together. Anyone can perform a service for another. But it will be devoid of what makes the bdsm life real and worth living.  Duty has us walk the narrows of life knowing we are in the right place, at the right time, doing the right thing. But one's duty is also unyielding in what is acceptable behavior and thought with stiff penalties if we stray far from its path. Failing in one's duty to his Master/Sir also brings the expectation of censure, reprimands or even punishment. Once the omission has been dealt with there is an equal expectation of picking up and continuing what you were suppose to be doing.
Duty is the glue that binds the household members together.