Wants vs Shoulds. A want is something that you acquire that makes you feel good. Some people don't think they 'should' be THAT selfish. Joy vs Pleasure. Joy is intellectual excitement, emotional involvement plus physical pleasure.
Pleasure is generally a mostly physical feeling.
The word 'selfish' can cause a negative reaction in some people. They feel the word should be changed to 'selfullness' or something less direct. But direct IS the idea here. These terrms have been used to describe someone who is selfish, but they are not accurate and give selfishness a bad name. In order for you to attract stuff, there has to be a you .