Belief is usually defined as a conviction to the truth of a proposition without its verification, therefore it is a subjective mental interpretation of the perception results, own contemplation/reasoning or communication.
Belief has a strong utility character, in practice we believe in more things than we are able to imagine. People believe in messages, causes, ideas, efficacy, love, persons and intentions, as well as, in many other plausible or not plausible events, such as ... horoscopes and hags.
"Police believe that thieves who stole a laptop and external hard drive from a Department of Veterans Affairs employee were interested in selling the equipment," from (Washington Post Staff Writer, June 9, 2006; Page A21). In such context, we also distinguish individual beliefs and numerous socially shared beliefs.
In the psychological sense, belief is a representational mental state that takes the form of a propositional attitude.
In the religious sense, "belief" refers to a part of a wider spiritual or moral foundation, generally called faith; historically generated by a group's need to provide a functionally valid foundation to sustain them. The generally accepted faiths usually note that when oppressive states are generated by it being exercised, and not a fact of reality, it was in need of more revelation or clarification.
In the classical logics, belief is considered propositional in that it is an assertion, claim or expectation about reality that is presumed to be either true or false (even if this cannot be practically determined, such as a belief in the existence of a particular deity). Historically, philosophical attempts to analyze the nature of belief have been couched in terms of judgement. David Hume and Immanuel Kant are both particularly well known for their analyses using this framework.
Knowledge is often defined as justified true belief, in that the belief must be considered to correspond to reality and must be derived from valid evidence and arguments. However, this definition has been challenged by the Gettier problem which suggests that justified true belief does not provide a complete picture of knowledge.
Belief can be understood as a state of mind in the process of increasing understanding that is sometimes called deduction. As people develop structures of understandings from their observed or learned facts (generally accepted truths), they create a theory that is not unlike a bridge, sitting on those pillars of facts. This process of building these structures is sometimes called induction. That is they create a general understanding of the specific facts. As they use those theories in their daily activities, research or experimentation, they use this state of mind that says: I believe the underlying structure is what I understand to be true, so based on this theory (faith), I will see what is to come of it. This thinking of applying faith is sometimes called deduction. That is they develop new, specific information from their general understanding. This application of the general principle to a specific situation is what can be called faith in ANY circumstances and belief is our thinking that it is applicable in this given situation. The religious belief does not differ in its essence from this thinking. The difference lies in the general approach to the specifics: it could be said that science generally builds up from facts using induction, while religion generally builds down from accepted general principles using deduction. The common area of these two pyramids is a diamond that is accepted from both directions. The understanding (faith) and the applicability of that understanding (belief) are such pairs.
The concept of belief presumes a subject (the believer) and an object of belief (the proposition) so like other propositional attitudes, belief implies the existence of mental states and intentionality, both of which are hotly debated topics in the philosophy of mind and whose foundations and relation to brain states are still controversial.
Beliefs are sometimes divided into core beliefs (those which you may be actively thinking about) and dispositional beliefs (those which you may ascribe to but have never previously thought about). For example, if asked 'do you believe tigers wear pink pyjamas ?' a person might answer that they do not, despite the fact they may never have thought about this situation before.
The idea that a belief is a mental state is much more contentious. While some philosophers have argued that beliefs are represented in the mind as sentence-like constructs others have gone as far as arguing that there is no consistent or coherent mental representation that underlies our common use of the belief concept and is therefore obsolete and should be rejected.
This has important implications for understanding the neuropsychology and neuroscience of belief. If the concept of belief is incoherent or ultimately indefensible then any attempt to find the underlying neural processes which support it will fail. If the concept of belief does turn out to be useful then this goal should (in principle) be achievable.
Philosopher Lynne Rudder Baker has outlined four main contemporary approaches to belief in her book Saving Belief:
Richard Dawkins, Sam Harris, and a number of others have proposed the idea that many (if not most) faith-based religious beliefs are actually delusional beliefs.
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