Usually "evil" and "good" can be broken down into self preservation vs preservation of the species. Other times good and evil depend on which end of the sword you're on.
SOCRATES; EXPLAIN WHAT IS HOLY AND UNHOLY; EUTHYPHRO; WHAT IS HOLY IS LOVED BY THE GODS AND WHAT IS UNHOLY IS NOT LOVED BY THE GODS; SOCRATES; IS IT HOLY BECAUSE IT IS LOVED BY THE GODS OR IS IT LOVED BY THE GODS BECAUSE IT IS HOLY? SOCRATES; EUTHYPHRO; WHAT DOES THAT EVEN MEAN? SOCRATES; ANSWER MY QUESTION!