What we call "evil" is only a part of life. We call "evil" the wolf and "good" the poor sheep, but it's clear that it's onlly a step of foodchain
These are the two principles that act in us: evil is animal, and good is the Divine. And we have to distinguish them strictly
Cause Satan or Lucifer want us also to be punished by god before the judment day or the second coming will happen.