" in contrast to the Hegelians of the right-wing, Marx made an honest attempt to apply rational methods to the most urgent problems of social life. The value of this attempt is unimpaired by the fact that it was, as I shall try to show, largely unsuccessful. Science progresses through trial and error. Marx tried, and although he erred in his main doctrines, he did not try in vain. He opened and sharpened our eyes in many ways. "

― Karl Popper , The Open Society and Its Enemies