Habitual thinking of philosophy is only to regard people's thinking activity simply as knowing activity. This has rendered the more important thinking activity of constructing practical concept that actually dominates the human transforming nature and society with the knowing activity. Marxist philosophical view, however, is that the human thinking activity is the inner unity in knowing nature, society and in constructing the practical concept of transforming nature, and society. Any practice that leads to the separation or overlapping of this inner difference and unity of the human thinking activity is either due to the old metaphysical materialism or to pragmatic idealism.