What is the Most Effective Way for a Ruler to Maintain Order?

I think most effective way for a leader to maintain order is to have lots of power over his people and be a really good convincer. A leader needs to know how to be really trustful because people want a reliable leader. The other important think he needs is to be a pervasive speeches. He needs to try and convince his people in his point. I think a really good example is Adolph Hitler.
He was a very good convince. He made lots and lots of people against Jews. He made really strong speeches how are the Jew aso bad. And he got what he wanted lots of people began to believe him. He was very powerful over his people.