  In QBism (or Quantum Bayesianism) a quantum state does not represent an
element of physical reality but an agent's personal probability assignments,
reflecting his subjective degrees of belief about the future content of his
experience. In this paper, we contrast QBism with hidden-variable accounts of
quantum mechanics and show the sense in which QBism explains quantum
correlations. QBism's agent-centered worldview can be seen as a development of
ideas expressed in Schr\"odinger's essay "Nature and the Greeks".
