In general, the nightmare quality of Marx's thought gives it, in this bedevilled age, an air of greater reality than the gentle complacency of the orthodox academics. Yet he, at the same time, is more encouraging than they, for he releases hope as well as terror from Pandora's box, while they preach only the gloomy doctrine that all is for the best in the best of all possible worlds.

Chapter I, Introduction, p. 4-5 - An Essay on Marxian Economics (Second Edition) (1966)