(1) Beliefs are involuntary, and not nonnally subject to direct voluntary control. For instance I cannot believe at will that my trousers are on fire, or that the Dalai Lama is a living God, even if you pay me a large amount of money for believing such things. (2) Beliefs are nonnally shaped by evidence for what is believed, unless they are, in some sense, irrational. In general a belief is rational if it is proportioned to the degree of evidence that one has for its truth. In this sense, one often says that "beliefs aim at truth" . This is why it is, on the face of it, irrational to believe...