“In studying a problem, we must shun subjectivity, one-sidedness and superficiality. To be subjective means not to look at problems objectively, that is, not to use the materialist viewpoint in looking at problems. I have discussed this in my essay “On Practice”. To be one-sided means not to look at problems all-sidedly, for example, to understand only China but not Japan, only the Communist Party but not the Kuomintang, only the proletariat but not the bourgeoisie, only the peasants but not the landlords, only the favorable conditions but not the difficult ones, only the past but not the future, only individual parts but not the whole, only the defects but not the achievements, only the plaintiff’s case but not the defendant’s, only underground revolutionary work but not open revolutionary work, and so on. In a word, it means not to understand the characteristics of both aspects of a contradiction. This is what we mean by looking at a problem one-sidedly. Or it may be called seeing the part but not the whole, seeing the trees but not the forest.”

— Mao Tse-Tung, On Contradiction