J. S. Mill

In every country, the executive is the branch of the government which wields the immediate power, and is in direct contact with the public; to it, principally, the hopes and fears of individuals are directed, and by it both the benefits, and the terrors, and prestige of government are mainly represented to the public eye. Unless, therefore, the authorities whose office it is to check the executive are backed by an effective opinion and feeling in the country, the executive has always the means of setting them aside or compelling them to subservience, and is sure to be well supported in doing so.

John Stuart Mill, Considerations on Representative Government (1862), Chapter IV