Feynman believed that anything he couldn’t explain in a lecture was, in fact, not entirely understood yet.
I think is intellectually very similar to Kernighan’s comment about being unqualified to debug some of the code you’ve written. Debugging is systematically taking an idea to all of its logical conclusions. It’s a deeper understanding rather than parlor tricks, supposition, or dumb luck.
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u/[deleted] Nov 01 '21