Don't fall to temptation. To defeat the darkness out there... you must defeat the darkness inside yourself.
There's no such thing as bad. Good and bad are fairytales. We have evolved to attach an emotinal significance to what is nothing more than a survival strategy of the pack animal. We are conditioned to invest divinity in utility. Good isn't really good, evil isn't really wrong, bottoms aren't really pretty. You are a prisoner of your own meat.
I always believe that evil isn't born. It's made.
There is no right and wrong. There's only fun and boring.
Evil doesn't always look evil. Sometimes it's staring right at us, and we don't even realize it.
Only Evil and Greater Evil exist and beyond them, in the shadows, lurks True Evil. And sometimes True Evil seizes you by the throat and demands that you choose between it and another, slightly lesser, Evil.