If the Sith draw their power from pain and hatred, where did Sheev draw his power from?

Vader hated himself and Sheev, and was in constant pain.Maul and Dooku hated Sheev, and experienced great pain during their training.What exactly did Sheev hate and/or get pain from? He was the undisputed ruler of the galaxy, and one of the most powerful Sith lords of all time. We don't ever really see him experiencing pain and hate firsthand. via /r/StarWars http://ift.tt/2hkuizt