We always thought that the definition of Goodness is "living for the sake of others", i.e. altruism.

I propose a better definition: Goodness is respecting and adhering to the natural order. You may also call it God's laws or purpose of creation. In any case, respecting our origin, which we call Heavenly Parent(s), and in this setting, bringing in our unique and ingenious spark and creativity. Like this, life will never be boring again! ;-)