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Lenin’s greatness lies in his aiming at goals arising out of realities. In this reality he sees a powerful steed which will carry him to his goal, and he trusts himself to it. But he never abandons himself to his dreams. This is not all. His genius contains another trait: After he has set himself a certain goal, he seeks for the means leading to this goal through reality; he is not content with having fixed his aim, he thinks out concretely and completely everything necessary for the attainment of that aim. He does not merely work out a plan of campaign, but the whole organisation of the campaign at the same time.
— KARL RADEK