Aldous Huxley, novelist

So long as men worship the Caesars and Napoleons, Caesars and Napoleons will duly rise and make them miserable. -Aldous Huxley, novelist (1894-1963)

And it doesn't have to be worship in the full sense. The Caesars were eventually considered gods, whereas Napoleon never was. However, many people thought Napoleon could do no wrong, which is effectively the same thing, and eventually he rose to make the world miserable.