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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Belief | 6/10 | https://en.wikipedia.org/wiki/Belief | reference | science, encyclopedia | 2026-05-05T13:43:50.348166+00:00 | kb-cron |
=== Internalism and externalism === Internalism and externalism disagree about whether the contents of our beliefs are determined only by what's happening in our head or also by other factors. Internalists deny such a dependence on external factors. They hold that a person and a molecule-by-molecule copy would have exactly the same beliefs. Hilary Putnam objects to this position by way of his twin Earth thought experiment. He imagines a twin Earth in another part of the universe that is exactly like ours, except that their water has a different chemical composition despite behaving just like ours. According to Putnam, the reader's thought that water is wet is about our water while the reader's twin's thought on twin Earth that water is wet is about their water. This is the case despite the fact that the two readers have the same molecular composition. So it seems necessary to include external factors in order to explain the difference. One problem with this position is that this difference in content does not bring any causal difference with it: the two readers act in exactly the same way. This casts doubt on the thesis that there is any genuine difference in need of explanation between the contents of the two beliefs.
== Epistemology ==
Epistemology is concerned with delineating the boundary between justified belief and opinion, and involved generally with a theoretical philosophical study of knowledge. The primary problem in epistemology is to understand what is needed to have knowledge. In a notion derived from Plato's dialogue Theaetetus, where the epistemology of Socrates most clearly departs from that of the sophists, who appear to have defined knowledge as "justified true belief". The tendency to base knowledge (episteme) on common opinion (doxa) Socrates dismisses, results from failing to distinguish a dispositive belief (doxa) from knowledge (episteme) when the opinion is regarded correct (n.b., orthé not alethia), in terms of right, and juristically so (according to the premises of the dialogue), which was the task of the rhetors to prove. Plato dismisses this possibility of an affirmative relation between opinion and knowledge even when the one who opines grounds his belief on the rule and is able to add justification (logos: reasonable and necessarily plausible assertions/evidence/guidance) to it. A belief can be based fully or partially on intuition. Plato has been credited for the justified true belief theory of knowledge, even though Plato in the Theaetetus elegantly dismisses it, and even posits this argument of Socrates as a cause for his death penalty. The epistemologists, Gettier and Goldman, have questioned the "justified true belief" definition.
=== Justified true belief ===
Justified true belief is a definition of knowledge that gained approval during the Enlightenment, "justified" standing in contrast to "revealed". There have been attempts to trace it back to Plato and his dialogues, more specifically in the Theaetetus, and the Meno. The concept of justified true belief states that in order to know that a given proposition is true, one must not only believe the relevant true proposition but also have justification for doing so. In more formal terms, an agent
S
{\displaystyle S}
knows that a proposition
P
{\displaystyle P}
is true if and only if:
P
{\displaystyle P}
is true
S
{\displaystyle S}
believes that
P
{\displaystyle P}
is true, and
S
{\displaystyle S}
is justified in believing that
P
{\displaystyle P}
is true That theory of knowledge suffered a significant setback with the discovery of Gettier problems, situations in which the above conditions were seemingly met but where many philosophers deny that anything is known. Robert Nozick suggested a clarification of "justification" which he believed eliminates the problem: the justification has to be such that were the justification false, the knowledge would be false. Bernecker and Dretske (2000) argue that "no epistemologist since Gettier has seriously and successfully defended the traditional view." On the other hand, Paul Boghossian argues that the justified true belief account is the "standard, widely accepted" definition of knowledge.
=== Belief systems === A belief system comprises a set of mutually supportive beliefs. The beliefs of any such system can be religious, philosophical, political, ideological, or a combination of these.
==== Glover's view ==== The British philosopher Jonathan Glover, following Meadows (2008), says that beliefs are always part of a belief system, and that tenanted belief systems are difficult for the tenants to completely revise or reject. He suggests that beliefs have to be considered holistically, and that no belief exists in isolation in the mind of the believer. Each belief always implicates and relates to other beliefs. Glover provides the example of a patient with an illness who returns to a doctor, but the doctor says that the prescribed medicine is not working. At that point, the patient has a great deal of flexibility in choosing what beliefs to keep or reject: the patient could believe that the doctor is incompetent, that the doctor's assistants made a mistake, that the patient's own body is unique in some unexpected way, that Western medicine is ineffective, or even that Western science is entirely unable to discover truths about ailments. This insight has relevance for inquisitors, missionaries, agitprop groups and thought-police. The British philosopher Stephen Law has described some belief systems (including belief in homeopathy, psychic powers, and alien abduction) as "claptrap" and says that such belief-systems can "draw people in and hold them captive so they become willing slaves of claptrap ... if you get sucked in, it can be extremely difficult to think your way clear again".
== Religion ==