r/RealPhilosophy • u/Friendly-You-9391 • 1d ago
Can you know something without being able to prove it - Rene Descartes and Al- Ghazali
In the 11th century, the philosopher Al-Ghazali, while searching for certain truth, argued that he couldn’t be sure his senses were reliable, because we can be dreaming without realizing it. Reasoning led him to this conclusion, but it also led to a spiritual and intellectual crisis: his reasoning could not justify why reason itself should be trusted. After months of crisis, he had a mystical experience in which, according to him, God showed him the truth. He concluded that there is a higher realm of judgment, inaccessible to us in ordinary life, which can judge reason.
Centuries later, Descartes began a similar search. He set out to rebuild his understanding of the world from the ground up, rejecting any belief that could possibly be doubted. His method led him to discard even mathematics. He ended up with the conclusion that because he thinks, he must exist. This became his foundation: his own existence is the one truth that cannot be doubted.
Both philosophers start by doubting what we normally trust, but they end in different places: Descartes in a certainty he sees at once, Al-Ghazali in a mystical experience.
In public life, including science, law, and universities, we accept beliefs that can be checked by argument or evidence, and we distrust ‘my intuition told me’ . One could argue reason-based epistemic framework has brought scientific progress. But there are issues arising from this framework. Nowadays, if someone asks how you know a fact and you answer “my intuition told me,” people won’t take you seriously. My point is: reason cannot justify everything, so sometimes intuition or direct experience may be a better source of justification.
Imagine someone presents you with a structured, step-by-step argument for why we should physically hurt people for fun. The premises look reasonable and the logic seems valid, but you are far more certain that the conclusion is wrong. You reject the argument, and rightly so. You don’t reject it because you found a flaw. You reject it because you are more sure the conclusion is wrong than that every premise is right. In this case, intuition is the better judge. So, refusing to acknowledge intuition as a valid mode of knowing leaves us vulnerable to hyper-rationalized absurdities, where any well-packaged argument must be accepted simply because we cannot immediately spot its logical trick or give a stronger counterargument.
However, moral intuition is the easy case. Mystical experience is the harder and more controversial one. Simply calling it “intuition” makes it too abstract. William James describes mystical experience as having a “noetic” quality: it feels like knowing, not just feeling. People who have them often report that they were deeply and lastingly changed. If an experience feels like knowledge to the person and transforms their life, it is hard to say they have no justification at all.
Perhaps mystical knowledge is problematic for social epistemology: when I ask others to accept a claim, they have no way to check it, challenge it, or hold me accountable if it comes from a private experience. This is a fair limit on what society can use as a basis for shared decisions. But that is a question about what can be publicly verified, not about whether a belief can be justified for the person who has it. Some scientific discoveries arrive as a sudden, complete insight, and scientists then write them up as “I assumed this, tested that, got this result” because that is the form others accept. The discovery was written backwards. Eureka insights become public knowledge once they are proven. If a mystical insight can be stated in a form others can test, it can follow the same path. Those that can’t be tested remain private convictions, which is the limit William James admits.
So here is my question: Can a person sometimes know something through an experience they can’t explain or prove to anyone else?