Where does evil come from?

Evil is a Human Concept.

13 Acacia Drive, Luton.

It comes from humans because it is a human idea.

It goes against Self Survival.

Intentionally doing harm to others goes against Reciprocity, and Empathy . . . Mix this with the gene's that make someone highly aggressive . . . You have a Psychopath. Since we didn't have the means to diagnose, we branded such actions under "Evil".

We lump those thing that go against basic human caring and dignity this way.
Good and Evil are from our earliest understandings of Light and Dark or Day and Night.

For theists, it is God whom is the creator of all things, and He boasts this very thing in Isaiah 45:7.

Evil is a behavior, that can originate in the thoughts of a mind, when one intends to carry out a harmful impulse or desire.

The first record of the development of "evil" desire and intent, is recorded at Genesis chapter 4, verse 1-5, where a sly individual set himself against God, to imply that Jehovah, was the liar: 

"Did God really say that you must not eat from every tree of the garden?”

The Woman replied: "You must not eat from it, no, you must not touch it; otherwise you will die."

And the response given to the woman- perhaps the original lie- was: “You certainly will NOT die."

The suggestion that Jehovah God was 'afraid' of the mortal couple, was absurd, of course.  And charge the that they might pose a threat to God, reach a par with Him, in power and wisdom, was hardly better. 

That single act- to slander and devalue Jehovah- sparked a long series of harmful, evil acts, that have caused unthinkable distresses for humankind.  And a series of evils.

Being imperfect, evil comes from within us. Daily we have to fight to do what is right, because doing good does not come naturally. The bible describes it as a struggle that we have within ourselves. (Romans 7:19) That is why it is vital to heed the bible's counsel to "return evil for evil with no one" and to "keep conquering the evil with the good" as Jesus did. (Luke 23:34) 

Because good conquers evil every time an evil thought is rejected, every time we refuse to return evil for evil.

Satan.

"Evil is in the hearts of mortal men" (not sure if that is an accurate quote). However the OT says that God created evil. Christianity and the NT say Satan is the reason for evil, the only problem is, God created Satan, so he still created evil. But I go with the quote.

Evil comes from all sorts of things the beutifull poppy flower but it brings us heroin. Leaves from plants turn into cocaine a highly addictive drug. So what looks pretty can fool u

Here's one interesting article: http://www.vision.org/visionmedia/religion_and_spirituality/origin_of_evil_1053.aspx

Then:

I guess we all have an understanding of "evil,' but here some additional perspective on the recent revival of the question of "evil" in general.

http://plato.stanford.edu/entries/concept-evil/