All relatively complete knowledge is formed in two stages: the first stage is perceptual knowledge, the second is rational knowledge, the latter being the development of the former to a higher stage.

• 一切比较完全的知识都是由两个阶段构成的：第一阶段是感性知识，第二阶段是理性知识，理性知识是感性知识的高级发展阶段。