selfish is Evil?

As you have observed the world around you, what have you seen that bears testimony of God?

My first thought would be the "conscience" that every person is gifted with. That we all have a pretty standard set of "good's" and "bad's". Murder. Stealing. Violence. Rape. Incest. Affairs.
And yet as my mind considers these things it seems as though I'm trying to answer a different question:

"How do you prove that God exists?"

Is it possible? What if you proved He exists by proving there's opposition?
There are bad things so there must be good things.
A person naturally wants to hide the "bad" things they have done. Is one proud to say, "I called Suzy Que fat.", "I stole a cd from Jake.", or "I lied to my boss and told him John ate his lunch, when it was really Zach."
No. Few times is a person proud to explain their affairs. So inborn in every human is the knowledge of what an evil action is. Do we all also know what a good action is then? Do we commend those who give of themselves, who are self'less?

Hm interesting. It seems I've stumbled upon something of a revelation and didn't even realize it. Every one of the "bad" things I listed, and can think of, are all done for selfish reasons. Every one. Me, me , me. " She and I have this special bond that her husband just can't understand.". "I've worked here for 30 years and haven't received ANY compensation. So I figure what's a few cd's here, or a few book's there?", "I have had to live with the knowledge that he took everything I had!!!! So I killed him."

So by this it seems that evil = selfish AND good = self-less