" Very often a man can hardly read and yet he takes nothing less than Marx's Capital, only to discover that he does not understand it. The less energetic and persevering lose heart; they consider the job of studying too difficult and drop it. And it is difficult only because the man tackles Marx without having either the skill or knowledge to master the subject, because he goes bear-hunting with bare hands, so to speak. "

― Nadezhda Krupskaya , On education: Selected articles and speeches