There is no one source of evil. Evil can originate in fear, which can override cultural and societal constraints and thus separate us from our humanity and cause people to commit unthinkable acts. Neurological glitches can also be the source of evil.

Good question, let me know when you find out. You just let it happen and observe. The meaning is different for each of us because it's a subjective experience.

A question about love, loving, and being loved. How do you determine the existence of these concepts?