Think for a minute about where selfishness ends....
If I reject the antiquated ideas of love and fidelity and consider embracing an egocentric selfishness, then it would be wise to count the cost before I step into that vortex. Once I step in, it will be incredibly difficult to step back out.
Simply look at earthly relationships. If I consciously choose selfishness, then I will only undertake those things that I calculatingly believe can maintain the illusion that I am the center. No healthy relationship will last in this absorption.
Furthermore, I am faced with a slow but steady, irreversible law of diminshing returns. My world will shrink, because I will only be able to enjoy or participate emotionally in those activities where I perceive myself to be exactly where and what I want to be.
But this means that I can only enjoy the dance of life when I can participate in it on my terms. One eventually learns that life cares very little about my terms. The facts of life are that I will grow old, that my ability to interact with this world will diminish, and that I will likely spend the last years of my life in significant isolation. If, in the days of my vigor and youth I start down a path where I only gain satisfaction by bending reality to my will, then I am certain to end my life in isolation, dependency, impotence, regret, and the empty vacuum accumulated by the slow steady., repeated choice to "Wander in the World of Self." Even other selves will only be valued to the extent that they conform to my will.
When the nurse brings me my pill on time and changes my diaper the moment I declare that it should be done, then I will be happy. When the nurse doesn't conform to my desire, then that person will be a insolent, subhuman, demon that torments me.
Thus revealing the sad and tragic fact that makes Eternity weep: I am in danger of becoming an insolent, subhuman, demon of torment.
But, the dance of Joy goes on, I just have long since lost the ability to choose it because I could not endure the pain that is part of it. And now all I have left is the pain I so desperately sought to avoid by isolating myself in the world of self. That which I so selfishly sought to avoid is now what I find myself totally immersed in.
"All neuroses result from a wrong response to suffering." - Carl Jung.