I had read this from osho times about a decade ago. A painter was trying to find innocent face to make his portrait. After wandering for long time, he found one gothala in grazing land. He's got that pure n' innocent look with whom the painter got satisfied. After few decades, the painter again thought to make a portrait of devil. He went through all the prisons but still not satisified. But finally, he saw that scary n' devil face in one prison. He made a painting of his picture. But the painter was amazed to see both persons were the same. Moral of the story: We can't judge people by merely by their one deed. The person being your closest friend or being most helpful to you get tempted to kill you, and your enemy may come to donate his/her kidney to save your life. We are living and changing constantly. I hope that we'll be able to change from that devil face to innocent look again.