One cannot do justice to Marx without recognizing his sincerity. His open-mindedness, his sense of facts, his distrust of verbiage, and especially of… - Karl Popper

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One cannot do justice to Marx without recognizing his sincerity. His open-mindedness, his sense of facts, his distrust of verbiage, and especially of moralizing verbiage, made him one of the world’s most influential fighters against hypocrisy and pharisaism. He had a burning desire to help the oppressed, and was fully conscious of the need for proving himself in deeds, and not only in words. His main talents being theoretical, he devoted immense labour to forging what he believed to be scientific weapons for the fight to improve the lot of the vast majority of men. His sincerity in his search for truth and his intellectual honesty distinguish him, I believe, from many of his followers (although unfortunately he did not altogether escape the corrupting influence of an upbringing in the atmosphere of Hegelian dialectics, described by Schopenhauer as ‘destructive of all intelligence’). Marx’s interest in social science and social philosophy was fundamentally a practical interest. He saw in knowledge a means of promoting the progress of man.