" On the other hand, far more people suddenly feel entitled to treat others differently now that they have the power. That is what happened to Lyndon Johnson once he attained a position of ultimate security in the Senate, as Senate majority leader. Tired of the years he had to spend playing the perfect courtier, he now relished the power he had to upset or humiliate those who had crossed him in the past. Now he would go up to such a senator and make a point of talking only to his assistant. Or he would get up and leave the floor when a senator he did not like was giving an important speech, making other senators follow him. In general there are always signs of these character traits in the past if you look closely enough (Johnson had revealed such nasty signs in the earliest parts of his political career), but, more important, you need to take notice of what people reveal once they are in power. So often we think that power has changed people, when in fact it simply reveals more of who they are. "
― Robert Greene , The Laws of Human Nature