" The greatest contribution to this faith was to be made by Socrates, who died for it. Socrates was not a leader of Athenian democracy, like Pericles, or a theorist of the open society, like Protagoras. He was, rather, a critic of Athens and of her democratic institutions, and in this he may have borne a superficial resemblance to some of the leaders of the reaction against the open society. But there is no need for a man who criticizes democracy and democratic institutions to be their enemy, although both the democrats he criticizes, and the totalitarians who hope to profit from any disunion in the democratic camp, are likely to brand him as such. There is a fundamental difference between a democratic and a totalitarian criticism of democracy. Socrates’ criticism was a democratic one, and indeed of the kind that is the very life of democracy. (Democrats who do not see the difference between a friendly and a hostile criticism of democracy are themselves imbued with the totalitarian spirit. Totalitarianism, of course, cannot consider any criticism as friendly, since every criticism of such an authority must challenge the principle of authority itself.) "

― Karl Popper , The Open Society and Its Enemies