From
Something Deeply Hidden, by Sean Carroll:
Quantum mechanics, in the form in which it is currently presented in physics textbooks, represents an oracle, not a true understanding. We can set up specific problems and answer them, but we can't honestly explain what's happening behind the scenes. What we do have are a number of good ideas about what that could be, and it's past time that the physics community started taking these ideas seriously."
The title comes from a quote by Albert Einstein. All his life he sought to understand the foundations of physical phenomena. "Something deeply hidden had to be behind things," and he was determined to figure out what it was. So is Sean Carroll.