A belief is a subjective attitude that a proposition is true or a state of affairs is the case. A subjective attitude is a mental state of having some stance, take, or opinion about something. In epistemology, philosophers use the term "belief" to refer to attitudes about the world which can be either true or false. To believe something is to take it to be true; for instance, to believe that snow is white is comparable to accepting the truth of the proposition "snow is white". However, holding a belief does not require active introspection. For example, few individuals carefully consider whether or not the sun will rise tomorrow, simply assuming that it will. Moreover, beliefs need not be occurrent, but can instead be dispositional.
Philosopher Jonathan Glover warns that belief systems are like whole boats in the water; it is extremely difficult to alter them all at once (for example, it may be too stressful, or people may maintain their biases without realizing it).
We are influenced by many factors that ripple through our minds as our beliefs form, evolve, and may eventually change.
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Epistemology is the branch of philosophy concerned with knowledge. Epistemologists study the nature, origin, and scope of knowledge, epistemic justification, the rationality of belief, and various related issues. Debates in contemporary epistemology are generally clustered around four core areas:The philosophical analysis of the nature of knowledge and the conditions required for a belief to constitute knowledge, such as truth and justification;
Potential sources of knowledge and justified belief, such as perception, reason, memory, and testimony
The structure of a body of knowledge or justified belief, including whether all justified beliefs must be derived from justified foundational beliefs or whether justification requires only a coherent set of beliefs; and,
Philosophical scepticism, which questions the possibility of knowledge, and related problems, such as whether scepticism poses a threat to our ordinary knowledge claims and whether it is possible to refute sceptical arguments.
Bertrand Russell famously brought attention to the distinction between propositional knowledge and knowledge by acquaintance
The analytic–synthetic distinction was first proposed by Immanuel Kant.
David Hume, one of the most staunch defenders of empiricism
René Descartes, who is often credited as the father of modern philosophy, was often preoccupied with epistemological questions in his work.