 The second is represented by Li Feng (d. 254), according to whom Fu Jia had misconstrued the relationship between capacity and nature. This is because whereas nature is inborn, capacity is shaped by learning. What nature provides is simply the biological apparatus or faculties that enable a person to grow and to learn; the person one becomes, in contrast, is the result of learning and putting into practice the teaching of the sages. Any accomplishment, including the attainment of sagehood, ultimately depends on effort. Yu Huan, a noted third-century historian, provides a helpful analogy to explain the point—the effect of learning on a person, he says, is like adding color to a piece of plain silk (Sanguo zhi 13, commentary).