“Quantum mechanics is the most useful and powerful theory physicists have ever devised. Yet today, nearly 90 years after its formulation, disagreement about the meaning of the theory is stronger than ever. New interpretations appear every year. None ever disappear. … The message from QBism is this: You needn't feel guilty about never getting nervous about this stuff. You were right not to be bothered. But for the sake of intellectual coherence, you had better reexamine what you wrongly may have thought you understood perfectly well about the nature of probability.”

“You ever think about this? Every year you live, you pass the anniversary of your death. Now you don't know what day it is, of course.”

“You know, it’s a funny thing about filmmaking, you always think you know just about everything, and you’ve done just about everything ever, and then you realize with your next project, “Holy hell, I haven’t had this challenge yet!” So, I think what I’ve learned is never to assume I know everything. Even, in all modesty, it’s been a pretty extensive, long-running career and I’m very fortunate. Like I said, never ever assume you know what you’re doing until you’ve studied everything, because everything is different and everything is new, and every day is new. You have to be on your toes and smart about it. That’s what I’ve learned over all those years”

“Have you ever given someone a book you enjoyed enormously, with a feeling of envy because they were about to read it for the first time, an experience you could never have again?”

“Surely, after 62 years, we should have an exact formulation of some serious part of quantum mechanics? By 'exact' I do not of course mean 'exactly true'. I mean only that the theory should be fully formulated in mathematical terms, with nothing left to the discretion of the theoretical physicist… until workable approximations are needed in applications. By 'serious' I mean that some substantial fragment of physics should be covered. Nonrelativistic 'particle' quantum mechanics, perhaps with the inclusion of the electromagnetic field and a cut-off interaction, is serious enough.”

“Know that ever about you stands the reality of love, and each moment you have the power to transform your world by what you have learned.”

“It's the movies that have been running things in America ever since they were invented. They show you what to do, how to do it, when to do it, how to feel about it, and how to look how you feel about it.”

“That classical theory had catastrophic implications for the constitution of matter was barely appreciated by Planck and others at the turn of the century, and played no substantial role in the development of quantum theory until Bohr's work 13 years later.
The lesson that could be drawn from this, and also from the development of general relativity, is that a crisis will only become creative if it is formulated in a mathematically precise manner. This conclusion has an echo in Bell's insistence on having quantum mechanics "fully formulated in mathematical terms, with nothing left to the discretion of the theoretical physicist", but what it really calls for is a critique of the "orthodox" theory fully formulated in mathematical terms with nothing left to the discretion of the critic.”

““Useful! You want to talk about useful? Have you ever read anything about politics? Economics? You know what keeps a culture alive?”
“Yes,” said Ernest sullenly, while M. Gargotier cleaned up the mess. “People not bothering other people.””

“I loved him, you know, but I have a theory about love. I think that, however good it is, some love isn't meant to be for ever.”