I quoted Feynman above. See my first post (I think).
I just found this one when he was asked about Relativity:
“….but after people read the paper a lot of people understood the theory of relativity in some way or other, certainly more than twelve. On the other hand, I think I can safely say that nobody understands quantum mechanics.”
Maybe you’ll tell me he wasn’t including Heisenberg’s Principle in these statements. I think he was but I have no definitive knowledge with which to argue that point.