"The enemy of pluralism is monism — the ancient belief that there is a single harmony of truths into which everything, if it is genuine, in the end must fit. The consequence of this belief (which is something different from, but akin to, what Karl Popper called essentialism — to him the root of all evil) is that those who know should command those who do not. Those who know the answers to some of the great problems of mankind must be obeyed, for they alone know how society should be organized, how individual lives should be lived, how culture should be developed. This is the old Platonic belief in the philosopher-kings, who were entitled to give orders to others. There have always been thinkers who hold that if only scientists, or scientifically trained persons, could be put in charge of things, the world would be vastly improved. To this I have to say that no better excuse, or even reason, has ever been propounded for unlimited despotism on the part of an elite which robs the majority of its essential liberties."
For the source of this quote see the selection Isaiah Berlin on Pluralism
