In a lengthy discussion of the composition and behavior of representative assemblies Constant has this to say about mediocrity (pp. 329-30):
The choice of the people belongs to men who command attention, who attract respect, who have acquired the right to esteem, confidence, and popular recognition. And these more energetic men will also be be moderate. People always take mediocrity as peaceful. It is peaceful only when it is locked up. When chance invests it with power, it is a thousand times more incalculable in its motion, more envious, more obstinate, more immoderate, and more convulsive than talent, even when emotions lead the latter astray.
About this Quotation:
Benjamin Constant is concerned here that “mediocre men” when they get elected to power, often do dangerous or foolish things. Viscount Bryce later in the century had similar concerns about the kind of men who were elected to the office of president in the United States. Friedrich Hayek just dismissed the lot when he wrote a chapter in The Road to Serfdom (1944) entitled “Why the Worst get on Top.”