When Feynman said “what I cannot create, I do not understand”, he was referring to *theories*. Every theory that we cannot derive from scratch, we do not really understand.

But is this just necessary but not sufficient? Can we derive a theory and still not understand it?

@tiago a theory of how something works and what causes it to work like that are two different things. I've used and seen many models of the former, trying to develop a causal understanding is much harder. I'd say you can't develop a causal model without understanding your hypothesis.

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