“Hayek sees that the zero-sum vision is fired by an implacable negative energy. It is not the concrete vision of some real alternative that animates the socialist critic of the capitalist order. It is hostility toward the actual, and in particular toward those who enjoy advantages within it. Hence the belief in equality remains vague and undefined, except negatively. For it is essentially a weapon against the existing order – a way of undermining its claims to legitimacy, by discovering a victim for every form of success. The striving for equality is, in other words, based in ressentiment in Nietzsche’s sense, the state of mind that Max Scheler identified as the principal motive behind the socialist orthodoxy of his day. It is one of the major problems of modern politics, which no classical liberal could possibly solve, how to govern a society in which resentment has acquired the kind of privileged social, intellectual, and political position that we witness today.”

"Hayek and conservatism", in Edward Feser (ed.), The Cambridge Companion to Hayek (2006)