I mentioned to a friend that perhaps there are physical or material things only. He said that is rather naive.
If I were to take the impermanence seriously, then even physical things (like mental things) do not exist as such. What is to say the appearance of things seemingly longer than thought is not as immaterial as thought itself. Just because the length of appearance is longer and seemingly more permanent does not mean it is permanent. So there is justification that things are not real as well.
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