The greatest sin in all of existence is the desiring of others to suffer solely because you have already suffered. Its a big combo of envy, wrath, greed and pride all in one. To wish agony on others because you have suffered agony and you don't think its fair that they don't. This its he most destructive thing in all of existence pulling apart the good things in the world. It ruins societies by making people recreate obstacles the world overcome out of petty spite for those that didn't face them. Its becoming engrossed in the unchangeable past and taking out that frustration on others. It hurts you and everyone around you and has no gain in anyway way.