From the context in which he's saying it, I don't think he means it in the sense you're thinking. I thought his reference to physics was an analogy, not an exact statement. I took it to mean more "don't assume that what you hear is true, if what you conclude based on the things you know is different, you should go with that."
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Oh the arrogance....the pride... my head hurts.
"First principles"... Must be that our interpretation of physics is THE first principles.
From the context in which he's saying it, I don't think he means it in the sense you're thinking. I thought his reference to physics was an analogy, not an exact statement. I took it to mean more "don't assume that what you hear is true, if what you conclude based on the things you know is different, you should go with that."