this post was submitted on 24 Jan 2024
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That's not what Descartes said, by the way.
"I think therefore I am" was all about "I know I must exist, because I'm here to think about it". It wasn't about "if I think something it must be true".
In Discourse he sets about trying to establish what things you can know for sure, vs which things are subjective (and could just be a trick of the mind or an illusion). He establishes the first principle that the one thing he knows is definitely true is that he is an entity that is capable of thought (because otherwise, who else is doing all this thinking?) and therefore at the very least he must exist, even if nothing else does.
If you're of the position that truth isn't subjective, "Cartesian doubt" should be right up your alley. Trust nothing until you can prove it! Not a bad position for a philosopher to take.