A Marxist begins with his prime truth that all evils are caused by the exploitation of the proletariat by the capitalists. From this he logically proceeds to the revolution to end capitalism, then into the third stage of reorganization into a new social order of the dictatorship of the proletariat, and finally the last stage -- the political paradise of communism.
Science is knowledge certain and evident in itself, or by the principles from which it is deducted, or with which it is certainly connected. It is subjective, as existing in the mind; objective, as embodied in truths; speculative, as leading to do something, as in practical science.