Professor James said:
My definition is good is whatever is positive to your morals. Evil is what's negative to your morals.
But this renders all of good and all of evil purely subjective. Do you then contend that there are no universals, or no near-universals, regarding good and evil?
In her private journals, Ayn Rand praised what she described as the "integrity" of a famous serial killer, simply because he didn't prescribe to society's rigid moral system, including murdering innocent people. By your definition in the OP, said serial killer served what was positive in his own morals and is therefore a just man. The problem I have with your definition is that it does not account for sociopathy and for mental illnesses which result in a broken ideology of good and evil.
My definition: good is doing what helps (not what enables) people, regardless of whether one is seen doing it. This applies to the self as well as to others. So doing something that improves one's own life is moral, in my view. Helping to improve another's life, regardless of whether one makes sacrifices or "gets credit," is moral. Evil is visiting harm upon another person, either directly by intention or by allowing another to be harmed by an action that may improve one's own lot (see: multinational corporations).
I should have been more clear. What I said was a more impersonal definition. What I really think is good is evil is this. Good benefits mankind, evil harms mankind. Or on a smaller scale good benefits someone while evil harms someone.
A very thought-provoking thread. Thanks!