So-called good karma is all too often taken for granted, and we usually do not do very much with it. If good and bad karma are relative, then good and evil are also relative. There can be no absolute good and absolute evil. What we call good is related to what we experience as harmony and what we call evil is related to what we feel as disharmony. Pain and suffering are a result of a lack of harmony.
Evil is simply the conflicting wills of imperfect beings.
So good and evil are always related to, not separate from, the kind and quality of consciousness that perceives them. They are certainly not personified in a God who is exclusively good and a devil who is exclusively evil. The cosmic whole is formed of myriads of beings, each in its own place on the ladder of evolution. These beings are learning, trying to improve themselves, trying to become more and more perfect. The higher they are on the evolutionary path, the more perfected they are and the more their actions and thoughts will be in harmony with the cosmic whole.