"If the proverbial man of the planet Mars would come to this earth and inquire about the difference between "leader" and "ruler" he would learn that "rulers" are strange people who dressed in ermine, wore crowns, married foreign women, kept strictly to themselves, and had the inclination to administer the country without asking the people about their wishes. A "leader," on the other hand, he would be told, is a regular fellow in a simple uniform who embodies his nation, who tries desperately to create by propaganda complete unison between his ideas and the people. A leader, he might hear, was a local boy who made good, who spoke everybody's language, who never traveled abroad and disliked titles and royal paraphernalia."
January 1, 1970
https://en.wikiquote.org/wiki/Ruler