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. (Mao Zedong)

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.

Mao Zedong

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development knowledge second higher

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