Mao Zedong: The real task of knowing is, through perception, to arrive at thought, to arrive step by step at the comprehension of the internal contradictions of objective things, of their laws and of the internal relations between one process and another, that is, to arrive at logical knowledge. To repeat, logical knowledge differs from perceptual knowledge in that perceptual knowledge pertains to the separate aspects, the phenomena and the external relations of things, whereas logical knowledge takes a big stride forward to reach the totality, the essence and the internal relations of things and discloses the inner contradictions in the surrounding world. Therefore, logical knowledge is capable of grasping the development of the surrounding world in its totality, in the internal relations of all its aspects. This dialectical-materialist theory of the process of development of knowledge, basing itself on practice and proceeding from the shallower to the deeper, was never worked out by anybody before the rise of Marxism. Marxist materialism solved this problem correctly for the first time, pointing out both materialistically and dialectically the deepening movement of cognition, the movement by which man in society progresses from perceptual knowledge to logical knowledge in his complex, constantly recurring practice of production and class struggle. https://wordsmith.social/protestation/quotes#quote2108