Written in 1913 by V.I. Lenin. It was dedicated to the Thirtieth Anniversary of Marx's death.
But this is not all. The history of philosophy and the history of social science show with perfect clarity that there is nothing resembling “sectarianism” in Marxism, in the sense of its being a hidebound, petrified doctrine, a doctrine which arose away from the high road of the development of world civilization. On the contrary, the genius of Marx consists precisely in his having furnished answers to questions already raised by the foremost minds of mankind. His doctrine emerged as the direct and immediate continuation of the teachings of the greatest representatives of philosophy, political economy and socialism.