It’s easy to define evil. It is simply a high amount of harm for little benefit, or at least little certainty of benefit.

Defining goodness is more difficult. It’s easy to know what you can do to help others, but turning yourself into a slave that is never rewarded for its efforts is impossible.

No, goodness is sustainable. It varies for each person, because what you can give without destroying yourself varies. So, goodness is just a slight bias. It is finding the small things you can change to bias things for the better.