feeling/mood is of course practically the same as empathy. moods have nothing to do with self. self is a mental construct that is not necessary for feeling. the very fact that helping out makes us feel good proves that feeling does not require a self. in this case its enough to be successful. helping out is skilful, skills are a joyful expression of life. the core ingredient of compassion is aliveness, vitality, not egocentric thought constructs. a depressed or sick individual will not be extremely compassionate, because their vitality and joy are often reduced. a heavy meal is depressing enough to prevent a millionaire from giving a fuck. the ego construct reduces compassion, because it brings fantasies into the mix of experience, that can easily ruin the joy. the thought of not receiving enough praise for my skillfull help might be enough to delete the joy out of practicing my skill. that is because i associate lack of appreciation with abandonment and that comes with anxiety, which deletes joy. its not because praise is required to make the action worthwhile. praise is only required to make the ego self construct bearable, thanks to a never ending nagging super ego.
much of what we do for entertainment puts our ego to sleep. games and movies and such. this shows that much energy is available, much action is possible, without self (construct) concern. therefore there is enough energy for compassionate action. but most of us cant have any social interaction without ego coming online. so we avoid interaction, meaning compassionate action, until its guaranteed, that our ego will be taken care of. a beggar might scare our self image (like most people), so any interaction with him would be unbearable, so we don't give him money. if we had less self concern, thoughts about identity would not bother us and we could give freely.