The Gettier problem — Philosophy, 14–17 years
Why having a true, well-supported belief may still fall short of knowledge. Philosophy, 14–17 years.
True luck is not enough
We often describe knowledge as a belief that is true and supported by good reasons. Gettier cases show a problem: a person can have a true belief for reasons that only happen to work. The answer is correct, but luck has done too much of the job.
Why define knowledge more carefully?
The problem matters because we trust people differently when they know something and when they have merely guessed correctly. In 1963, Edmund Gettier described short cases that challenged the older formula of justified true belief. They forced philosophers to ask what makes reasons connected to the truth.
The stopped clock
At noon, Ana looks at a clock showing 12:00 and believes it is noon. The clock stopped yesterday at 12:00, so her belief is true today by luck. Her evidence looks good, and the time is true, but the clock is not tracking the present time. This is a Gettier-style case.
“True and justified” must be enough
The tempting mistake is to say that any true belief with evidence is knowledge. That rule feels fair because reasons and truth are both important. Gettier cases reveal the missing link: the belief must not be true merely because an unrelated accident rescued a faulty route to the answer.
Checking how an answer was found
This idea helps when judging headlines, online posts, diagnoses, and exam answers. Do not ask only, “Is it true?” Ask, “What process produced it, and would that process usually connect with the truth?” A correct result reached by a broken method deserves caution.
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