All contradictory things are interconnected; not only do they coexist in a single entity in given conditions, but in other given conditions, they als… - Mao Zedong

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All contradictory things are interconnected; not only do they coexist in a single entity in given conditions, but in other given conditions, they also transform themselves into each other. This is the full meaning of the identity of opposites. This is what Lenin meant when he discussed "how they happen to be (how they become) identical--under what conditions they are identical, transforming themselves into one another".