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STT
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Mind is fundamental in dualism and the stuff we experience is content of our mind. Now consider a set of minds which each experience a specific internal and external reality. We share the same external reality therefore our content of mind, external reality, should be synchronized and be same all the time. This is impossible unless an agent, God for example, sustains our content of our mind accordingly. We however observe fantastic complexity in our body and the world around us. There was no need for that complexity if we are supposed to only experience the reality. Therefore idealism at the best is absurd.