Belief is the mental state in which an individual holds a proposition to be true. Beliefs are often metaphorically referred to as maps, and are considered valid to the extent that they correctly correspond to the truth. A person's knowledge is a subset of their beliefs, namely the beliefs that are also true and justified. Beliefs can be second-order, concerning propositions about other beliefs.
- Dennett, Daniel C. (2006). Breaking the Spell. New York: Viking. ISBN 067003472X.