Selfish and Your-Selfish (each always capitalized)
Selfish denotes that part of each one of us whose job and interest is to take care of ourselves and our own self interests, both for our Now and for our Next. Whenever wanting to indicate more specifically the Selfish as that part of yourself or that part of another person, you can denote that part more clearly by using that person’s name in the word construction, as an example, Dwight-Selfish (denoting my Selfish part).
Your-Selfish is used to denote your Selfish (as distinct from anyone else's Selfish and from the Selfish that refers to everyone's Selfish).
Oneself consists of parts: Selfish and Express.
Usage example: His Selfish was reluctant to loan his friend $200. But his Service kept pushing him to be more generous.